IMR 4064 Smokeless Powderimr 4064 is considered the most multipurpose propellant while in the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Tremendous Short Magnum, 308 Winchester, 338 Winchester Magnum, plus the record goes on and on. Flexibility with uniformity and accuracy.This smokeless powder i