IMR 4064 is a medium range burn speed powder and is one of the most versatile propellants in the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Short Magnum, 308 Winchester, 338 Winchester Magnum, and the list goes on and on. Versatility with uniformity and accuracy. Load Data 223 Remington Bullet: 55gr Barnes TSX 0.224" C.O.L. 2.185" Starting Load 21.2 Grs. 2,871 Fps. 43,900 Psi. Max Load 23.5c Grs. 3,116 Fps. 52,500 Psi. 308 Winchester Bullet: 150gr Nosler E-tip 0.308" C.O.L. 2.800" Starting Load 43 Grs. 2,663 Fps 44,700 Psi. Max Load 46.7c Grs. 2,883 Fps. 59,800 Psi.