Just thought I'd throw this one out to "the floor" as it were to get everyone elses opinion. Due to unfortunate work commitments I had to send my custom .260 (shilen 1-8" twist on trued rem 700 in Hunters edge stock) to a local load development "specialist" to have a long range load worked out. A while later the rifle came back with the report that it was shooting 1/2 MOA with 140gn A-Max's. Great! I take it hunting at the next opportunity and whack a deer with it. Problem is the pressure was so high that the brass extruded into the ejector hole and when the bolt was opened, shaved that said piece of brass locking the ejector in the bolt face. The powder charge looks reasonable according to various manuals. One thing I noted was a projectile would not fit in the neck of a once fired case..... Something I have not seen before. The loads were developed in Lapua .308 brass necked down WITHOUT a neck turn. My rifle has a standard chamber. My theory is that the necks are so thick that on ignition the neck has inadequate room to release the bullet causing a pressure spike. Loaded round neck dia is 0.297" Anyone have any thoughts/ideas/comments?