The only to know the measurements of your barrel is to measure the muzzle and the bore proper. You can do this yourself, but you need a tool that is a little on the expensive side.
The alternative is determining the performance of your choke. To do this, pattern the gun at 40 yards and compare your percentages to the standard charts (70% - Full, 60% = Mod, etc). Keep in mind that you'll need to get at least a five shot average (ten shots would be better) and that every time you change the load, you might get some drastically different results.
Hahaha guess I should have looked at the barrel like 00Mod said, right there next to 20 ga. 2 3/4 in. it has MOD. stamped clear as day :lol: guess I should pay more attention to detail. Thanks for the advice tho guys
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