Two things - first, you can shoot 2 3/4" shells in your 2 1/2" chambered gun -the pressure doesn't go up that much, so if you're shooting low pressure there's no worry. Second, if you find a low pressure 2 3/4 load use it in your 2 1/2" shell, at least that's what I do. Good luck - Paul
I have shot tens of thousands of 2 3/4" hulls in my 2 1/2" guns and have never encountered any problem whatsoever. As Paul said, tests have demonstrably shown pressure increases, if any, are statistically insignificant. Remember, gun manufacturers such as Parker who cut chambers 2 5/8" recommended 2 3/4" ammunition be shot in them. They wanted the hull to open inside the forcing cone to provide a better gas seal. I wouldn't dream of going to the trouble of shortening hulls. I wonder if our hangup with chamber length comes from being a nation of riflemen where chamber length, etc., is everything.
