IMR 4064 Smokeless Powder imr 4064 is considered the most functional propellant inside the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Shorter Magnum, 308 Winchester, 338 Winchester Magnum, along with the record goes on and on. Versatility with uniformity and accuracy. https://roselynek912fhh5.livebloggs.com/profile