I have tapered reamers to open chokes and just recently did a VH 12 gauge Parker s/n 2218xx for a friend. I’ve done this work for a while now on many maker guns and can tell a factory bore by its uniformity and surface finish. Right bore on that Parker was .742” dia and choke .713” for 29 points of constriction = 3/4 choke (I-Mod). Left bore was .732 with choke .694” for 38 points = Full choke. Both bores and original chokes appeared “factory” to me. I’ve seen mismatched barrel bores occasionally and chalk it up to the maker wanting to salvage a barrel tube that was damaged during the bore finishing operation, and then the shop overbored to clean up the scratch, gouge, chatter marks or whatever. Just my take here gents.
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Threaded Mode