The 250gr round nose is a similar profile to the xtp,and ive had this in my chamber at 2.10".The barrel was fully locked up, and when opened the round came out as easily as a 38 spl,and still measured 2.10".I dont have to push the dummy bullet in at all ,it slides in to the rim like butta.Does anyone have a spare max brass i could mock up to test? Thanks Mike