I have rifles for many purposes, but can't find a purpose for a 6mm any more. I hunt varmints ( .22 cal centerfires and rimfire) and fur bearing critters like coyotes ( similar .22 cal cartridges / bullets) and I used to shoot .243's or .250 Savage / .257 Roberts cartridges for deer, but found I prefer either faster / longer range cartridges or heavier bullets. So now the .25-06 / 120 grain is my smallest caliber rifle for hoofed game. And I prefer 7mm for most medium game. A 140 grain bullet at 2800 fps is a good starting point for me. And I am content to use a couple of very accurate .222 and .308 rifles for target shooting. So none of the new AR cartridges appeal to me for any purpose I can think of.
