IMR 4064 Smokeless Powder imr 4064 is considered the most flexible propellant within the IMR line, utilized for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Brief Magnum, 308 Winchester, 338 Winchester Magnum, along with the checklist goes on and on. Flexibility with uniformity and accuracy. https://samuelu345qwc3.wikiinside.com/user