IMR 4064 Smokeless Powder imr 4064 is considered the most flexible propellant inside the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Tremendous Quick Magnum, 308 Winchester, 338 Winchester Magnum, and also the record goes on and on. Versatility with uniformity and accuracy. https://christopherk901ffh5.plpwiki.com/user