A 1 1/4 ounce proof should be a heavier proof than a standard proof. Does it have 3 1/4 tons on it anywhere? Perhaps a inquire to the proof house would tell you what it would have been proofed for. I suspect you have a gun that was proofed for a heavier load, hence more pressure.

Last edited by KY Jon; 02/02/14 01:41 PM.