Without a gauge you really don't know what you have; you simply can't know the constriciton with just the brass gauge. With that said some very fine driven pheasant guns will have the right choke tighter because the birds are incoming. I have a 7 pin sidelock like that which was built for a member of a European Royal family and now resides humbly in my game/gun room.
I also had a 12 gauge 1929 Parker that I undestood was Skeet out (tighter) right barrel and skeet in (more open) in the left barrel. I was told it was built that way because in gun down as oppose to pre mounted skeet the first shot on doubles is farther away because of the time necessary to get the gun mounted and the second in comer is closer.
If your gun is original this could be the reaso.
Other possibilities are that someone was happy with the right barrel choke but thought the left was too tight and they just went a little farther than one might expect when they opened the left barrel. I know of a Belgian gun where this occurred.
Also as noted above it is possible someone wanted it that way for decoying birds.
Trigg
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Threaded Mode