IMR 4064 Smokeless Powder imr 4064 is easily the most flexible propellant in the IMR line, employed for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Limited Magnum, 308 Winchester, 338 Winchester Magnum, and also the listing goes on and on. Versatility with uniformity and accuracy. https://charlesr246qvv1.wikitron.com/user