IMR 4064 Smokeless Powderimr 4064 is the most flexible propellant from the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Tremendous Short Magnum, 308 Winchester, 338 Winchester Magnum, as well as the checklist goes on and on. Versatility with uniformity and accuracy.This smokeless powder can be a sm