Just received a 22" proof prefit for my Bighorn Origin chambered in 6.5 PRC using a .154" freebore reamer from nick at Straightjacket Armory. Took me 30 minutes to switch rifle from 6cm to 6.5 PRC with bolt head change and swapping barrels. I bore sighted, put one on paper, chased it with turrets and shot 4 more. This was first group with factory 147 eldm ammo. Reamer was set up to jump .008-.012 if I remember correctly. Nick said he has been having outstanding results with the 147 factory stuff and this reamer. I'd say he ain't lying.