accuracy dropped off pretty bad after 1500 rnds at 3047 fps on the first bbl, but i put about 1800 on it. second bbl got 2400 or 2500 rnds through it, but i reduced the powder and velocity to 2980ish (don't recall velocity exactly, but i'm counting rounds these days by stacking empty 100ct primer boxes on my desk... one stack for each bbl. heh. i don't keep data books anymore.) i'm at least 700 into the 3rd bbl and it's shooting really well right now. best of the 3 so far. interestingly, i special ordered the 260AI reamer with a specific neck size, and my smith said he chambered one other guy's gun with it, so this reamer is on it's 4th bbl.