IMR 4064 Smokeless Powderimr 4064 is the most multipurpose propellant within the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Tremendous Quick Magnum, 308 Winchester, 338 Winchester Magnum, along with the checklist goes on and on. Flexibility with uniformity and accuracy.This smokeless powder is real