Does anyone have a rifle or know someone with a rifle chambered for the 6XC cartridge? It's a 6mm caliber developed by highpower competitor David Tubb. While not trying to start a debate over whether some cartridges are "inherently accurate" or not, I'll just point out it's won a lot of highpower competitions at Camp Perry.
You can now get new brass for it, but it's based upon a .22-250 case necked up to 6mm. If the parent case was good enough for a .257 caliber bullet, it ought to do fine with a .243 bullet too.
Seems like it would make a decent sporting round. Low recoil, yet capable of putting down deer, antelope, or anything smaller with the right bullet. I'm not expecting any of the big gun makers to start offering it as a standard chambering; but, I'd think it'd be a good choice for a youth or wife wanting to get into rifle hunting. Or someone like me, who likes to shoot his hunting rifles and doesn't want his shoulder pounded more than is necessary.
Outside of the catalog I get from Creedmore Sports, I never see any mention of the 6XC.