Barrel wear

nemesisenforcer

December 03, 2013 20:27

is most barrel wear caused by gas cutting or jacketed bullet on bore friction?

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  SoreShoulder

  January 08, 2014 08:43

  quote:Originally posted by MIKE WISKEY
  just to note; most rifle barrels are 'stress releaved' read annealed, all quality barrels are dead soft steel (no heat treating to harden them). They are hardened and then tempered to remove much but not all the hardness. I think they tempered to a dark blue oxide in the days of temepring by eye.
  
  The strength of AISI 4340 steel is only 60,000 psi when dead soft. If it were under firing pressure the stress inside would be hydrostatic so it wouldn't necessarily fail even under an overload of 70,000 psi but then the bullet would hit the rifling and the root of the land would fail. It's gotta be hardened or guns couldn't run at 65,000 psi.

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