The IMR 4166 Powder may be on the slow side but will be interesting with heavier bullets. _gaq.push(['_setDomainName', '.accurateshooter.com']); very consistent in .243 shooting 65gr vmax and 3550 fps. IMR is an acronym for Improved Military Rifle. As with all load development, reference a credible reloading manual, then start at the minimum and work up in small increments. Many F-Open competitors are now using Reloder 16 with considerable success. It acts a whole lot like Varget, but is much easier to find. The pelletized form makes for faster reloads with pre-formed charges that easily drop down the barrel and is easy to pack without the need for measures or funnels. Will purchase more. The initial heat condition of your powder will affect the burn rate, Bryan Litz explained at a recent Applied Ballistics Seminar. So they would likely show much larger swings than what these four top-performing powders showed. This propellant performs comparably to Hodgdon Varget but charge weights are materially different. It provides top performance in big game cartridges such as 25-06, 280 Remington and 300 Winchester Magnum. Has anyone left switched from 4064 to 4166 without losing accuracy? This powder is comparable to Hodgdon H4831. My factory sierra high 2576 Working up a good hunting load with the 4166 Enduron and the Hornaday 150 gr GMX bullets for my 308. I do not see it listed for 40 grain bullets. I'm using this in my Tikka CTR 223 under 73 gr Berger BT target bullets. The new line of IMR Enduron powders feature small kernels for easy metering, plus a built-in copper fouling eliminator. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. forum.accurateshooter.com/threads/imr4166-loads-for-223.4053707/, Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36. IMR 4166 was released a few years ago as a temperature insensitive powder that is expected to replace 4064. Very consistent velocity, quality powder, not so good on powder throw due to it being a stick powder. _gaq.push(['_setAccount', 'UA-6323545-2']); It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. IMRs press release states: IMR 4166 [has] a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington and dozens more.. Address: xxl-reloading.com, Gartenweg 9, 83661 Lenggries, Germany. The illuminated reticle made it very easy to see on the black target, and honestly was the first time I have ever had used the feature (now it may be hard to go back). Good luck. Anyone seen/tried this combo? Weve been quite pleased with IMR 8208 XBR as a Varget alternative. Choose from a variety of powders for everything from small-caliber ammo to magnum rifle cartridges in both 1 lb canisters and 8 lb jugs. Each of these are still favorites with handloaders today! I bought all three. The responsible reloader always errs on the side of caution, so I decided to stop there. Improved Military Rifle IMR 4166 Improved Military Rifle IMR 4320 Improved Military Rifle IMR 4350 Improved Military Rifle IMR 4451 Improved Military Rifle IMR 4831 Improved Military Rifle IMR 4895 Improved Military Rifle IMR 8208 XBR Improved Military Rifle SR 4759 Ramshot Big Game Ramshot TAC Ramshot X-Terminator Shooters World AR PLUS Please enter your login details below. On the official Hodgdon/IMR burn rate chart, IMR 4166 is between H4895 and Varget. The LabRadar is a new type of device that allows you to measure muzzle velocity within at least +/- 0.1% of the reading. However, due to the super short kernels, metering is virtually as good as a spherical powder. IMR 7977 performs comparably to Hodgdon H1000 but charge weights are materially different. It is also outstanding in cartridges like the 444 Marlin and 7.62 X 39. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. Please help us to improve and report any suggestions via our contact form. It's been over two years of this ammo & reloading nightmare. of 4166 in Peterson SRP brass topped with 168 gr SMK's seated 0.010" off gave me great performance. For info on other IMR powders, visit www.imrpowder.com. IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. First load. This powder is comparable to Hodgdon H4350. The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. 44gr 4166 No reviews found. The Hide Armory. Tried their 7977 in a magnum rifle and it had same accuracy as H1000. Find load data for IMR 4350 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4350 is a medium- to slow-burn rate propellant and is the number one choice for the new short magnums, both Remington and Winchester versions. For a better experience, please enable JavaScript in your browser before proceeding. The technology in IMRs Enduron line of powders provides four very important qualities that enhance both in-gun and downrange performance. This propellant is ideally suited for many mid-range burn speed cartridges. However, to up the ante the Enduron line also utilizes copper fouling reducing technology to help keep your bore free of the hard to remove copper. IMR 4166 possesses the fastest burn rate in the Enduron lineup. Share your experiences with other customers. A versatile, match-grade propellant, IMR 4166 is comparable to Hodgdon Varget. VAT (where applicable), shipping costs and possible delivery charges. Find load data for IMR 4227 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4227 is a medium burn speed, magnum pistol propellant. That is very, very low. It is expected to perform well in the .308 Winchester and in 6mm cartridges running the heavier (95-107gr) projectiles. It is primarily a pistol powder but has some application in rifles. The top shooters in the PRS and veteran long-range shooters in other disciplines have learned to value a temperature-stable powder. IMR 4166 performs well in the .308 Win (for bullets up to 175 grains) and in 6mm cartridges running the heavier (95-107gr) projectiles. An acronym for. It is an extruded powder and provides top performance for big game cartridges like 25-06, 270 Winchester, 280 Remington and 300 Win Mag, among other cartridges. You are using an out of date browser. We are engineers, reloading enthusiasts and operate one of the most powerful ballistics calculators. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; With no pressure signs up to 45.8 grains of 4166 I decided to push further and see what I could get. $49.99 - $357.99 4.48 17 reviews IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. In this post, I've got some great highlights including the LEE . Naturally the next step was to combine the two for a new line of powders. Most powders arent specially formulated to be temperature stable. Load data for 50 loads in caliber 7 x 57 with .284 | 139gr . It is the perfect burn speed for cartridges such as .308 Win, 7.62mm NATO, 22-250 Rem and 257 Roberts. PrecisionRifleBlog.com (PRB) recently published results from a field test PRB conducted to quantify the temperature stability of the popular Hodgdon H4350 and Varget powders and compare those to IMRs new Enduron line of powders, specifically IMR 4166 and 4451. I was planning to switch to 4166 for my .308, but it seems that it has also become nearly impossible to source. IMR 7977 is the slowest burn rate Enduron Technology powder. Is there a different load data site? You may not reproduce original text or photos without advanced permission in writing. Moving on, the individual loads were fired and the barrel was allowed to cool between each group. Trail Boss Reduced Rifle Load. These new powders should compete directly with the Hodgdon Extreme Series, which gives shooters more temp-stable powder options to consider. This propellant performs comparably to Hodgdon H4831 but charge weights are materially different. They both love it. Load data for the new IMR 4166 was taken from Hodgdons 2015 Annual reloading manual, and in increments of .3 grains or less, loads were worked up from 24.0 through 25.1 grains of IMR 4166. The manual allows for stiffer charges, but at 25.1 the load begins to compress. Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR End. IMR 4451 is a mid-range burn speed powder, ideally suited for cartridges such as .270 Winchester, .30-06 and 300 Winchester Short Magnum. For more information and IMR 4166 LOAD DATA visit imrpowder.com or check the 2015 Hodgdon Annual Manual. The first IMR reloading powders included ever popular favorites IMR3031 (1934), IMR4064 (1935) and IMR4350 (1940). Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder". Loads case to bottom of bullet, clean burning, very consistent, accurate results with no flyers, flows thru powder measure with a. Share the post "Guide to IMRs Enduron Powders What You Need to Know", Powder Valley Inc. (PVI) now has the new IMR 4166 powder. ARCHIVED. In today's shooting you can clearly see the scatter that centers at 45.5 and the obvious OCW at 46.2. CC 300 BLK ($53.49 per box of 20), Law Tactical Gen 3-M AR Folding Stock Adapter, 2022 Editors Choice Award Winning Silencer Central Banish Backcountry Suppressor. .1 to .2 gr accuracy. For example, IMR 4166 is a good replacement for Hodgdon Varget (commonly used in the .223 Rem, 6mmBR and .308 Win), while IMR 4955 is a fine substitute for H4831 (favored by F-Open shooters for the .284 Win and 7mm WSM cartridges). For those who ask.I am obviously loading for a 556 NOT a 223. otherwise why mention I would be using only cases marked as 556! I paid $159.00 for 8# Varget at Shooters last time I was up there. Posted by Christopher Brown on Apr 19th 2022. Cant find Hodgdon Varget on dealers shelves? spitzer boat tail & imr 4166, 223 80 gr bullet imr 4166, 223 load with imr 4166, 243 barnes 80 gr ttsx imr 4166 load data, 243 barnes 80gr ttsx imr 4166 load data, 243 barnes ttsx with imr 4166 load data, 243 barns ttsx with imr 4166 . 3, tried this powder and same bullet in the grandson's Ruger77 .223. .223 Rem. Taking the rifle back to the workbench for a cleanup proved the claimit had virtually no copper fouling, as proven by the absence of a blue hue in the exiting patch soaked in Sweets 7.62 bore solvent. IMR 4166 + 55gr V-Max in 223 Rem tailbon3 Jan 19, 2017 Help Support Long Range Hunting Forum Become a supporting member tailbon3 Well-Known Member Joined Aug 24, 2009 Messages 84 Jan 19, 2017 #1 I'm looking for some load data for the 55gr V-Max in 223 Remington with IMR 4166. For example, variation in velocity does NOT appear to be linear across the full range of temperatures. The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly. Find load data for IMR 4451 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 4451 is a versatile, match-grade propellant with a mid-range burn speed in the Enduron line. We continue to prioritize our shipments to our traditional sales channels to maximize powder availability at retailers. Shooters looking for readily-available alternatives to hard-to-find extruded powders should definitely check out the Enduron line-up. Address: xxl-reloading.com, Gartenweg 9, 83661 Lenggries, Germany. Very happy with the results. IMR 4166 is part of their new Enduron line that launched just a few years back. IMR4166-08: IMR 4166 8 LBS. Across the board, the Enduron line is very insensitive to temperature changes, which is important for both match shooters and hunters. Or maybe have QuickLoad data? IMR 4166 is one of the new Enduron family of propellants. when enduron works it is often same hole shooting. Importantly, it seems to be a good substitute for unobtanium Varget powder. If a pistol says Magnum, IMR 4227 is the choice for true magnum velocities and performance. I have heard the same criticism from other forum members. IMR 7977 has the slowest burn rate among the Enduron Technology powders. This powder is comparable to Hodgdon H4831. It may not display this or other websites correctly. Find load data for IMR 3031 propellant by clicking the button "Loads for this Powder".More about this powder:A medium burn speed propellant with many uses, IMR 3031 has long been a favorite of 308 Match shooters using 168-grain match bullets. Love the copper fouling eliminator makes cleaning a breeze, Posted by Paul rosenkranz on Nov 9th 2021. Find load data for IMR 7828 SSC propellant by clicking the button "Loads for this Powder".More about this powder:IMR 7828 SSC is a magnum rifle powder with exactly the same burn rate as standard IMR 7828 and uses the same data. . Then Try IMR 4166 Powder, Powder Temp Stability IMR Enduron vs. H4350 and Varget, http://precisionrifleblog.com/2016/06/19/powder-temp-stability-hodgdon-extreme-vs-imr-enduron/, Powder Temp Stability: IMR Enduron vs. Hodgdon Extreme, Guide to IMRs Enduron Powders What You Need to Know, Powder Valley has new IMR 4166 Powder in Stock, IMR Introduces New Enduron Powders: 4166, 4451, 7977. .1 to .2 gr accuracy. The manual allows for stiffer charges, but at 25.1 the load begins to compress. From the 17 Remington to the 243 Winchester to the 375 H&H Magnum, accuracy and performance are excellent. DuPont had historically been a major supplier of military propellants long before becoming one of the handloaders favorite powders. This Enduron series powder is temp-stable and accurate. By that, they mean the change per degree from 20 to 65 might be smaller or larger than the change per degree from 65 to 140. - 24hourcampfire Previous Thread Next Thread Print Thread Hop To BP-B2 IC-A B3 IC-B B4 RR1-22 Who's Online Now 828 members ( 10Glocks, 12344mag, 007FJ, 1911a1, 1100mag, 95 invisible), 2,340 guests, and 1,313 robots. Was able to find a node fairly quickly and with a little seating adjustment, it's shooting .3 moa or better. More about this powder: IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. That means swings in ambient outside temperature can affect your internal ballistics, which will directly affect your muzzle velocity, which will change your bullets trajectory. IMR Legendary Powders now offers four (4) Enduron powders: IMR 4166, IMR 4451, IMR 4955, and IMR 7977. IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. Guide to IMR Enduron Powders Temp Stable, Reduced Fouling, IMR Introduces New Enduron Powders: 4166, 4451, 7977, Guide to IMRs Enduron Powders What You Need to Know, IMR Enduron 8133 New Slow-Burn-Rate Magnum Powder, IMR Powders introduces IMR 4955 Enduron Powder. A versatile, match-grade propellant, IMR 4166 is comparable to Hodgdon Varget. View Product Warning DEALER LOCATOR Precision shooters will find an Enduron option well-suited to most popular precision cartridge types. Average extreme velocity spread was only 19 fps for 15 Sierra 142-grain MatchKing bullets fired from prepared cases filled with precisely weighed IMR-4166 charges. I shot a 4.125", 10-shot group at 600 yds - well under 1 MOA and slightly better than my Varget loads, although they were close enough that I attribute the difference to the shooter. The accuracy results were almost identical to those of Varget, with my best group coming in at 1.05 MOA from a 24.6-grain charge of 4166not bad for an initial round of load development. bolt reload data with 65gr. In rifles, this powder delivers excellent velocity and accuracy in such cartridges as the 22 Hornet and 221 Fireball. Great stuff! * All prices incl. These short-grain, extruded powders will deliver temperature insensitive quality while keeping copper residue to a minimum. Thread starter cornhusker; Start date Sep 18, 2017; Forums. Site Notices. When we are sold out, we are sold out. IMR recently released a new line of powders with Enduron Technology which is also marketed to have extreme temperature stability. The weight of a kernel of 4166 was almost double the weight of a kernel of H4895, and they were clearly larger. Whether a rifle is sighted in during the heat of summer, hunted in a November snowstorm or hunting multiple locations with drastic temperature swings, point of impact with ammunition loaded with Enduron technology will be very consistent. We do not take backorders and our Tech Services team cannot take orders via email or phone. Sierra load data for over 95 Berger bullets in over 65 calibers with all suitable powders on the market. Anyway, I like the 4166! (The only two .45-70's I own are trapdoor Springfields.) The folks at PrecisionRifleBlog.com meticulously loaded 6.547 Lapua ammo with each powder using some of the best equipment available. bolt reload data with 65 gr. We are engineers, reloading enthusiasts and operate one of the most powerful ballistics calculators. Find load data for IMR 4166 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. I use in 243 Win and 6.5 CM. Load . Share the post "Powder Valley has new IMR 4166 Powder in Stock". We continue to prioritize our shipments to our traditional sales channels to maximize powder availability at retailers. You may not reproduce original text or photos without advanced permission in writing. Other than that , great job, thanks. In 2003, Hodgdon Powder Company acquired the IMR brand bringing these prestigious powders under the umbrella that also includes Hodgdon, Winchester and GOEX. The rifle was placed on the 50 yard line and supported both fore and aft by sandbags. Be sure to enter theNES/MFS March Giveaway ***Taurus G3c***. http://www.hodgdonreloading.com/data/rifle, Hoping to find a fat girl to slurp my eel, http://optimalchargeweight.embarqspace.com/, http://www.northeastshooters.com/vbse-a-little-help-with-target-analysis-for-OCW. A Meopta MeoStar 1.710x riflescope was mounted to ensure an optimum sight picture. Select 223 Remington, check off your weights, select IMR, then 4166 I was able ti find a load for two different 55s, a 69, and a 75. Powder Valley Inc. (PVI) and Midsouth Shooters both have plenty of IMR 4166 in stock right now. As a medium burn speed propellant, XBR is ideally suited for cartridges like the 223 Remington/5.56mm, 308 Winchester/7.62mm NATO and the 6mm PPC. For a better experience, please enable JavaScript in your browser before proceeding. Full Member. It is an extruded powder and is perfect for cartridges like 270 Winchester, 30-06 or 300 Winchester Short Magnum, among others. So, I'd use it for loads listed by Hodgdon. OK, we're down to 1/3 MOA with a bit more to go. Find load data for IMR 4831 propellant by clicking the button "Loads for this Powder".More about this powder:IMR 4831 has a slightly slower burn rate speed than IMR 4350. I tried 4166 and my groups opened up. It may not display this or other websites correctly. .223 Remington (Hodgdon Data Using IMR Powder) reloading data with 221 loads. If you are the site owner (or you manage this site), please whitelist your IP or if you think this block is an error please open a support ticket and make sure to include the block details (displayed in the box below), so we can assist you in troubleshooting the issue. Find load data for IMR 8133 Enduron propellant by clicking the button "Loads for this Powder".More about this powder:IMR Enduron 8133 is the slowest burn rate in the Enduron family. It is available right now at Powder Valley in both one-pound ($25.45) and 8-pound ($182.75) containers: IMR4166-01: IMR 4166 1 LB. Trail Boss is based on new technology that allows very-high loading density, good flow through powder measures, stability in severe temperature variation, and, most importantly, additional safety to the handloader. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. Loading density is perfect for the very large magnums, including the 6.5mm and 7mm magnums. Perhaps the new IMR 4166 will be as good or better. Loading density is perfect for magnums, contributing to superb uniformity. Most powders arent specially formulated to be temperature stable. IMR 4166 is one of IMRs Enduron family of propellants. IMR now offers four Enduron powders that cover a broad range of burn rates. I understand this is an old thread, but want to reply anyway, 243 75gr V-Max loads using StaBall or IMR 4166. It also offers good load density and meters reasonably well. CLICK HERE to Read Full Powder Temperature Stability Test on Precision RifleBlog.com. 110 PCS pistol, 2022 Editors Choice Award Winning Ruger 5.7 LC Carbine, 2022 Editors Choice Award Winning Mossberg 940 Pro Tactical 12-gauge, Fiocchi Introduces New 5.7x28mm Subsonic Ammo, Lehigh Defense 115-gr. The components in question make up my service rifle load in .223 and they are Hornadys 55 grain V-max bullet seated into a Lake City brass case at an OAL of 2.270 and ignited with a Wolf Small Rifle Primer. Once they had a couple dozen rounds loaded with each powder, they went and shot them with each powder at 25 F, 65 F, and 140 F. The muzzle velocity of each shot was recorded using both a LabRadar Doppler Radar and a MagnetoSpeed Chronograph. New customer? CL 2.005 These are the first groups with this powder. Below you will see today's round robin from 45.0 to 46.4 grains of 4166. 2. When I hit that node It's going to be great. 5 rounds shot IMR now offers four Enduron powders that cover a broad range of burn rates. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data. Mag. WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. 4451 is the medium burning powder, for medium cartridges like the .30-06 Springfield and the .270 Winchester. Give it a try if you've already purchased it. _gaq.push(['_setDomainName', '.accurateshooter.com']); This website uses cookies to ensure the best experience possible. (function() { It is formulated to reduce fouling and to be stable across a wide temperature range. Key: Admin , Global Mod , Mod RR2/3-22 UDG-IP It is a true magnum cartridge propellant with outstanding performance in such cartridges as the .300 Winchester Magnum, 7mm Remington Magnum, .338 Lapua and more. This website uses cookies to ensure the best experience possible. IMR 4166 is an extruded stick powder. . Was looking for an equivalent powder from H4895 when I ran into the 4166. _gaq.push(['_trackPageview']); First ladder turned out great! Hodgdon Powder Co., distributors of Hodgdon, IMR, and Winchester powders, says that: The new IMR Enduron Technology powders will be available at dealers in early 2015 in 1-pound and 8-pound containers. For more information and Enduron LOAD DATA visit imrpowder.com or check the 2015 Hodgdon Annual Manual. First used in battle in 1805 by United States naval forces against pirates off the coast of Algiers, DuPont supplied more than 80% of Allied Forces powder needs in World War I. Reloading 223 Rem./5.56mm is mostly the usual routine. Villain Weapon Systems ATPIAL-C EFL -- Enhanced Class 3R Performance Available Now from TNVC! Cant Find Varget for Sale? The IMR brand was first introduced under DuPont in the 1930s. so I am thinking till powder does come available, load one or 2 levels under Max for a 223 into the 556 cases. First load. Learn more about Enduron powders at www.enduronimr.com. I don't see any info for the A-Max though. Generally no two rifles will like the same exact load. 3, e-mail Hornady and the powder mfg. Be Alert: Publisher cannot be responsible for errors in published load data. Using Hodgdon's online Reloading Data Center I find IMR 4166 listed as an appropriate powder for several 223 loads, from 50 grains bullets all the way up to 90 grain bullets. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges. Access from your Country was disabled by the administrator. Loading density is perfect for magnums, nicely filling the case at maximum charges, contributing to superb uniformity and accuracy. IMR 7977 is comparable to Hodgdon H1000. Then Try IMR 4166 Powder", A couple seasons back, PrecisionRifleBlog.com (PRB) published a significant field test of powder temperature stability. Bullets ranged from 50- 77 grain , same bullets shot very well with Varget anf H4895 . This ensured the powder charges were identical for each round of ammo. We place limited powder inventory for sale on a regular basis on our website. msinc The Rifle: Savage 10fcp, 24" 5r, accustock .308 Win, Vortex Viper PST 4-16 Target distance: 100 yards Shot off front and rear sand bags from a bench However, Alliants relatively new Reloder 16 is an extremely temp-stable powder, with a burn rate that is a close match to H4350. Using bullets from Nosler BT LF, Barnes VG FB, Nosler BT, SinterFire, Sierra SP, Speer SP, Sierra HP, Barnes TSX FB, Hornady FMJ, Hornady V-Max, Swift Scirocco, Sierra HPBT, JLK VLD, Sierra MK, Berger BT Targ. PRBs test team also noticed other interesting trends in the data. Plain cartridges, in contrast, turned in an average extreme spread of 51 fps. Shooter's Reference Load Data for .223 Remington .223 Remington - Published Manufacturer Loading Data Shellholders: Hornady #16 Lee #4 Lyman #26 RCBS #10 Recipe Type: Rifle 55,000 PSI STANDARD SAAMI COMMERCIAL SPECIFICATIONS Pistol CUSTOM LONG THROAT Reduced Load Bullet Weight: ALL 30 gr 34 gr 35 gr 36 gr 40 gr 42 gr 43 gr 45 gr 50 gr 51 gr 52 gr IMR now offers five (5) Enduron powders: IMR 4166, IMR 4451, IMR 4955, IMR 7977, and IMR 8133. In 2015, IMR will introduce three (3) new Enduron powders: IMR 4166, IMR 4451, and IMR 7977. I use this powder in my 6mm dasher bench gun. Sep 25, 2010 . This is a true magnum propellant yielding outstanding performance in 6.5-300 Weatherby, .264 Win Mag, 28 Nosler and .300 Rem Ultra Mag, among other cartridges. Hodgdon's excellent online reloading data show only IMR 4007SSC, IMR 4166, IMR 8208XBR, and Hodgdon CFE 223 breaking 3,750 fps with a 55-grain bullet in a 24-inch test barrel. If you commonly use Varget, Alliant Reloder 15, Norma 203B, IMR 8208 XBR, or Vihtavuori N140, you might want to try IMR 4166. Once they had a couple dozen rounds loaded with each powder, they went and shot them with each powder at 25 F, 65 F, and 140 F. The muzzle velocity of each shot was recorded using BOTH a LabRadar Doppler Radar and a MagnetoSpeed Chronograph. Fired from My Rock River Arms National Match upper, these rounds consistently fetch accuracy in the .75 to 1.25 MOA area.