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 May 15, 2001, 10:49 AM #1 Riss Senior Member   Join Date: February 14, 1999 Location: Eastern, PA, USA Posts: 147 What is the minimum diameter threading to go for a rifle muzzle when rethreading. I wanted to go to 1/2 x 28 tpi, but was told it doesn't leave enough meat around the .308 bore. Any help ?? Anyone have experience in this area ? Have seen some gun makers go this small on a .308 but usually only find it on a .223 __________________ An X is still an X with a Quarter Inch group at 100 yards With a Quarter Inch Group on the keyboard an X could be - Z,S,D, or C. I am a quarter inch typist - Please excuse the errors!
 May 17, 2001, 09:17 AM #2 kurt IA. Senior Member   Join Date: February 19, 2001 Location: Iowa Posts: 141 I would say that it,s too thin. Lets do some math. .498 This is normal size for a .5 thread, depth of thread 28 TPI, .866/28= .030 So .498-.060 ( .030*2 because it,s per side) = .438-.308= .130/2=.065. .065 or about 1/16 of an inch is all the meat you will have. You decide. Do you realy want 55,000 psi contained by only 1/16 of a inch of steel?
 May 17, 2001, 10:00 AM #3 Riss Senior Member   Join Date: February 14, 1999 Location: Eastern, PA, USA Posts: 147 i'm no machinist thats why i asked the question. Have already been yelled at for even thinking of changing the HK. Don't worry, I won't do it. Thanks __________________ An X is still an X with a Quarter Inch group at 100 yards With a Quarter Inch Group on the keyboard an X could be - Z,S,D, or C. I am a quarter inch typist - Please excuse the errors!

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