I would think if the chambers actually measured 2 1/2", they may have been intended for 2 5/8" shells. The chambers in the 20 ga I was discussing are actually 2 3/8", and I would think were truly intended to be used with 2 1/2" shells following the 1/8" shorter theory. The difference here is not 1/4" but rather 3/8" and why I asked about using a 3" shell with 1 1/8 oz 3 dre load in a 12 ga with 2 5/8" chambers (3/8" shell to chamber length difference)
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"There are two kinds of hunting: ordinary hunting, and ruffed grouse hunting"-Aldo Leopold
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