I've got a three groove Pac-Nor barrel chambered for 264 Win. Mag. with an 8" twist. Shoots the 140 SMK's great at just over 3000 fps. Not the most efficient cartridge in the world, but the dies were only $40. How many rounds of 6.5-284 would I have to fire in order to save $200 in powder to cover the extra expense of the dies????
That's my story and I'm stickin to it!!!!!!