And I wouldn't worry about 2 1/2" chambers. Sherman Bell did some test with 2 3/4" shells in 2 1/2" chambers and pressure only went up 500psi, or so. If you loading around 7000psi to start with you won't have a problem. I believe in that article he also used some 3" shells with no ill effects. I normally use 3/4oz of shot in the 12ga and 7/8 is my Magnum load. There are many low pressure loads with a lighter shot charge.
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Paul Harm
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