I bought a aftermarket choke for my 725 12 ga. and had a friend mic it to check the constriction. I found out that my bores measure .736, rather than the standard .740. Just seeing if anyone else has checked there's
The lower barrel measures .738 in. via Skeets bore gauge, the upper barrel at .739. The exit diameters of the Invector DS choke tubes were a bit puzzling. The IC tube measures .739, the Mod .731, and the Full at .702 inch. Yes, you read that correctly: the choke tube etched “Imp. Cylinder– Lead / Mod. Steel” has essentially no constriction at all. At best, in the lower (slightly tighter) barrel, you have .001 in., .007 in., and .036 in. constrictions, the “Full” choke designated as a lead-only choke.
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