i have a winchester modle 70 short action with a .308 bolt face and am thinking of builing a one hole paper puncher/ varmit rifle but interested in what some of you guys think a good caliber would be. i don't want anything too exotic but want something that is very accurate have been considering a 22-250 but didn't know if something in the 6mm range would be better. just not sure about a .22 caliber bullet at fairly long range.