Long Branch barrel thread differences |
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Zed
Special Member Donating Member Joined: May 01 2012 Location: France Status: Offline Points: 5585 |
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If you know the TPI (Threads Per inch) you can calculate the length of one thread. That will be how far the barrel moves in for one full 360° turn.
So if you need let's say 45° extra turn to clock in properly. You would need to remove the equivalent of 1/8 of a thread width. So carefully measure the angle to get it clocked in. Then work out how much metal needs to be removed from the barrel shoulder to rotate the barrel into the correct position. You may need to ream the chamber and possibly drop back to a smaller bolt head.
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britrifles
Senior Member Joined: February 03 2018 Location: Atlanta, GA Status: Offline Points: 6539 |
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Reynolds book has a write up on the breeching up angle used in the No. 4 rifle. For a while it was 18.5 to 31.5 degrees. The high end was later considered excessive resulting in some bulged chambers on firing. 18.5 degrees was considered essential for satisfactory breeching up. So, you might want to have your smith measure that angle before machining off material from the barrel shoulder.
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Goosic
Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 8792 |
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I am just relating to you what I have learned from experience. It is not uncommon to cutback the beeching up faces to get the correct contact between the reciever and barrel.
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