Ok, shot my 260 AI varmint contour CBI bbl from NSS and then sent it off for muzzle brake, leade lengthened, nitrided.....and got it back, set it up, and shot it again.....It is super consistant....but at 100, i'm getting 1" to maybe 3/4" groups (very light wind, sunny, benched).......before and after the work.....this is fireforming, or once fired, neck sized cases....140 grainers...Berger, Sierra spitzers (hunting bullet) and Nosler custom comps...powder H4831SC, and RL17.....I'm going to try 48.0 grn.s of Win 760 per nosler manual with 100 gr Nosler Ballistic tip.....Now, those groups aren't bad by any means, but i was honestly expecting better...scope is tight, Sharp Shooter trigger set at 1-1/2 .B&C tact stock skim bedded, tang free floated, screws torqued to 45 in lbs. Anybody have one in this caliber?....maybe i need to stretch it out to 200-500 hundred yards? Any help would be great....Thanks, rsbhunter
before work, stock bbl

after work done...might just be a 1" bbl????