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Thread: Finally post chamber lapped little "Old School"

  1. #1

    Finally post chamber lapped little "Old School"

    Finally post chamber lapped little "Old School"

    CYA friends:


    I finally got little "Old School" post chamber lapped.

    When one post chamber laps a chambered and finished barrel it has to be done in a jig...

    Actually, I do all of my lapping in a jig.....but it is an absolute must with a chambered barrel...

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    Anyway, I was going to cast a new lap, then inspected my last finishing lap, closely, and decided it would work fine..

    So I shot the bore full of oil, inserted the lap and extended half of it out of the muzzle....

    I then cut it off.....leaving the lap half as long...

    I then bumped the lap up, at the muzzle.....( if you tried bumping up a lap in a taper lapped bore at the breech, you'd never get it back to the muzzle...........)

    And then in the actual lapping, I used a trick that I've taught the CYankee schmidts......to keep from restricting the bore at the breech..

    When you lap a bore in a jig, you wind up restricting both ends of the bore......

    Restricting the muzzle end is kool, but, restricting the breech end kills accuracy.....

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    Anyway, little "Old School" is finally PCL'd.......

    And it is absolutely perfect.......the perfect slow slugging feel, and, the perfect fast slugging feel......( the fast feel is the most important)

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    So, this little thing is perfect, which means, it probably won't shoot in a bucket.......

    It's windy right now.........but the day ain't over.........

    Your friend, Bill Calfee

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    The little thing is absolutely perfect, which means it probably won't shoot in a bucket........

    If you look closely at the lapping rod, you'll see the "gray mud" that is produced while one laps...bc

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    Last edited by Bill Calfee; 08-08-2017 at 08:33 PM.

  2. #2

    Too windy to test last evening

    Too windy to test last evening

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    CYA friends:


    Way too windy to test this little thing last evening...

    Was a long night thinking about it...

    Hopefully today......( probably all for naught, since it probably won't shoot in a bucket anyway)

    Your friend, BC

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