IMR 4064 Smokeless Powderimr 4064 is easily the most versatile propellant while 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, as well as listing goes on and on. Versatility with uniformity and accuracy.This smokeless powder is rea