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Long Branch barrel thread differences

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Zed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: February 08 2021 at 11:59am
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.
It's nice to be important, but it's more important to be nice!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: February 08 2021 at 12:14pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: February 08 2021 at 2:14pm
Originally posted by Canuck Canuck wrote:

Goosic, thank you so much! I will relay that info to my buddy if you agree to allow me to do so.
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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