The M2 that I had and the Vinci that I currently have would/will shoot 2.75", 1 1/8oz low recoil (1145fps) Win AA loads reliably. ETA: I think this is on the very edge of reliability but they've been good to date.
I used to shoot a fairly large local 3 gun match with both and saw a bunch of M2s in action. Some said they had issues running the LR stuff but I never actually saw it happen. If I were to guess that would be 20+ guys running M2s. We even had a stage once that we had to shoot from the hip. Don't recall any malfs in my squad or hearing of any on other squads and there would have been some bitching, I promise!