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Progressive / Gain rifling comes in two type . Basically twist and depth or depth and twist …..
I been trying to think of the name of the rifling that’s being ask about in this topic . Its bugged me all day . I must be coming down with old timers or something .
Anyway the light finally came on . Its call Fosbery rifling after Lieutenant Colonel George Vincent Fosbery
. Holland and Holland bought the rights and called it the “Paradox “
I believe Holland and Holland still markets it today .
Should be able to do a search and read up on it . Look for Paradox gun or Paradox rifling
Man my head hurts trying to get that out of there LOL . Im going to have to go lay down now LOL
But understand this type of rifling doesn’t just start , it’s a gradual transition in that once the rifling starts it doesn’t restrict the bore
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