- Versatile enough to work well with a large variety of cartridges
- Works especially well with a number of Remington, Winchester and Swift models
For shooters who want a super-versatile propellant powder that’s consistent and compatible with a wide variety of cartridges, delivers every time. It works especially well with the 223, 22-250 and 6mm Remington, 308 Winchester, 338 Winchester Magnum, 243 Winchester Super Short Magnum, and the 220 Swift, in addition to a long list of other popular cartridges. It’s a perennial favorite with hunters who are looking for a powder that offers uniform consistency and enhances accuracy.imr 4064 load data.
Production of IMR powders dates back over 200 years when the company was originally founded by E.I DuPont. Available for use in many reloading applications, the IMR series of powder is trusted by reloaders all across the globe.
is one of the most versatile propellant in the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Short Magnum, 308 Winchester, 338 Winchester Magnum, and the list goes on and on. Versatility with uniformity and accuracy.
- Do not exceed the loads displayed in the reloaders guide.
- Never mix any two powders regardless of type, brand, or source.
- Never substitute any smokeless powder for Black Powder or any Black Powder substitute
Military rifle propellant was manufactured in batches in a procedure taking about two weeks6 from treating cotton linters with nitric acid, through curing the extruded grains to evaporate excess ether and alcohol, and finally coating the dried grains with DNT and graphite.
Each batch had somewhat different reaction rates, so testing was required to determine the appropriate charge to generate required reaction pressure in the intended cartridge.
Test results were forwarded to the factory or arsenal assembling cartridges.7 Propellants packaged in small sheet metal canisters for sale to civilians were labeled Military Rifle Powder to distinguish the product from low-density “bulk” propellants intended to react at lower pressures in shotguns or pistols and from Sporting Rifle Powder for early lever-action rifles unable to withstand the pressures of 20th-century service rifle cartridges.
Charges of low-density “bulk” propellants were often similar to the volumes of gunpowder used in older firearms and reaction rates were less variable at low pressures appropriate for those cartridges;8 but each batch of military rifle propellant required a different canister label specifying the batch or lot number with the tested charge weight to generate appropriate reaction pressure in intended cartridges.
Orders from countries fighting World War I required determining charges for different European military rifle cartridges, and production volume supported research for improvements. Improved military rifle propellants included a longitudinal perforation converting each grain to a tube with a progressive burning interior surface allowing a more consistent gas generation rate through the reaction period.
Early propellants were identified by a two-digit number. As the number of experimental variations increased, each improved military rifle propellant was identified by a four-digit number. In addition to the canisters available from DuPont, the Director of Civilian Marksmanship (DCM) sold surplus improved military rifle propellants to members of the National Rifle Association.
By 1936 improved DuPont process control produced batches conforming to published reloading data rather than requiring different charge specifications for each batch;9 and those propellants have remained in production. Non-conforming batches were used to load commercial and military cartridges following traditional testing procedures.
Wartime temporarily interrupted production of civilian specification propellants, as major quantities of new specifications were manufactured. Number 4831 was used to load navy anti-aircraft machine gun ammunition, and number 4895 was used to load United States service rifle ammunition.
As these propellants became military surplus after the war, large quantities of different batches were blended together to make products with uniform average performance for sale to civilians. Manufacture of these specifications for civilian use resumed after military surplus had been exhausted; but reaction characteristics were slightly different from the products distributed from military surplus supplies.[