My main to grouse guns are a PH 16 that is choked CYL. and Full....Perfect. On a windy day I will shoot the full choke barrel with a regular 16 gauge load. If I think the birds may hold I will use a speader in the full choke barrel to open it to about Mod. The 20 gauge Trojan is choked MOD. and Full so I just use a spreader in both barrels.
I am not a real fan of messing with Parker chokes but if you must I prefer a gunsmith that hones them to open them up vs. a reamer. The hone will follow the original bore much better than taking the chance of a reamer cutting off axis resulting in an out of regulation bore.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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