While I think the 6mm Remington is a better cartridge than the .243 Winchester, it sort of lost out to the .243, and there is not much in the way of commercial ammunition I have found. I can get 80, or 95 grain and 100 grain easy enough, but for 105 grain, 85 grain, 75 grain, 70 grain, 58 grain I need to reload. If one does not reload .243 seems to me the way to go in the 6mm arena.