Bob: I agree with ArtS 's comment regarding TULA chokes. Also, I have seen a bunch of older guns, including muzzleloaders have what is called a "Jug" choke put in them to change cyl to a tighter choke. The old-time turkey shoot/card meat shoot guys out here in the Southern Midwest did it on a regular basis with barrels having all kinds of choke in them. Some were threw such a tight pattern they would blow the card off the post.
Just some thoughts.
__________________
Bruce A. Hering
Program Coordinator/Lead Instructor (retired)
Shotgun Team Coach, NSCA Level III Instructor
Southeastern Illinois College
AMM 761
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