Not necessarily “jug choked”, Ted, as that implies a recess being formed before the choke to produce a constriction.

It has been re-bored twice from 13 to 13/1 and then 13/1 to .729 ( the final re-Proof might not have involved any bore enlargement and was perhaps purely precautionary).

Each time, by not letting the cutter or hone go all the way to the muzzle, the barrel borer has the opportunity to increase the choke by up to 10 thou.

Last edited by Parabola; 12/23/23 01:12 PM.