HI, .730 should be factory norm in a 12 ga., about 4 to 5 inches in front of chambers should be about .070 to .090. down by muzzel between .025 to .040. so if the barrels are "nice and clean" you should be fine to shoot low pressure loads (i try to keep below 7500 psi). my trap and skeet loads are 5000 psi in 12 ga. 7/8 th oz and 1 0z. scott
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