IMR 4064 Smokeless Powderimr 4064 is among the most flexible propellant during the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Tremendous Shorter Magnum, 308 Winchester, 338 Winchester Magnum, and the list goes on and on. Flexibility with uniformity and precision.This smokeless powder is often a s