To answer Paul Harm's question of different ways to open chokes there are several. Sunnen hone (many find the finish unacceptable), Brownells offers an adjustable reamer set up similar to Porterfields, high quality expansion reamers aided by ingenuity can produce good results, Clymer offered excellent choke reamers that fed from the breech and were driven from the muzzle ( they cost $175 each 25 years ago and you needed 3-4 per gage), for those with lathes or mills excellent results can be attained but set ups are time cosuming, and finally a barrel boring machine ( I don't know of any U.S. gunsmith with one). For those you who object to anyone opening the chokes on their Parkers, I noticed Dean had the chokes altered by a very well respected gunsmith on the 28 gage he is offering on this forum.
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