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08-19-2013, 11:42 PM
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#1
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PGCA Invincible
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Join Date: Dec 2008
Posts: 33,230
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Thanked 36,458 Times in 13,338 Posts
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Parker Bros. choke profile has been described by Austin Hogan (and possibly others) as an "ogee choke". I have some of his plotting data here someplace. It has also been published in Parker Pages along with the plotting chart.
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08-20-2013, 11:52 AM
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#2
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Research Chairman
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Join Date: Nov 2008
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My 1928 SC with 32" barrel has a bore of .735. The choke starts 4" from the muzzle and continues at the same rate until it's 1" from the muzzle. At that point there is about 1" of parallel. Final choke restriction is .040
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