Originally Posted by DRM
But the inside diameters of barrels from different manufacturers today vary a fair amount for any given standard gauge, plus some manufactures additionally overbore their barrels to, in theory, reduce recoil by reducing velocity. So I guess you might conceivably end up shooting a 12 gauge shell in a 13+ bore barrel. Yet it’s choke is still determined from constriction to this oversized-for-gauge barrel.

Slight correction: overboring could lead to a 12 gauge shell in an 11 gauge barrel, not a 13 gauge.

13 is smaller than 12 when it comes to shotgun gauges.

Last edited by Geoff Roznak; 07/27/26 09:51 AM.