280 Ackley Hart barrel .313\" neck I just recently got my gun back from Hart after having a new barrel installed. It is a 280AI 40 degree shoulder 26" barrel 1 in 9 twist on a Sako action. I bought a box of Nosler 280AI brass. Loaded some 160 and 140 AB's with medium loads of RL22 and IMR4831 respectively. The loaded rounds mic'ed .310" outside neck diameter and chambered easily. All good to go. The gun shot well and after depriming the cases I again mic'ed the outside neck diameter of the unsized cases. They measured .311" close to the shoulder and .310" at the end of the neck. A bullet could be forced into the neck by hand with moderate force. Seems like a pretty tight neck. Tighter than advertised. The concentricity gauge showed them to be perfectly concentric. No problem, I can outside neck turn the necks down. The brass mic's .013" to .014" neck thickness. Question is, how much would you take off the neck and to what thickness. I could just seat the bullets, put a light crimp on with the LFCD and shoot again. /ubbthreads/images/graemlins/shocked.gif Is some space around the neck necessary?