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|February 13, 2014, 09:32 PM||#1|
Join Date: January 24, 2011
Location: Trinidad, CO
Safe Barrel Spec.
I am building a 50BMG bolt gun in school an am trying to build it correctly, i.e. safely, but for little cost. I am using only 4140 steel for the receiver and barrel accessories and am having it professionally heat treated.
My question is: does anyone know what the US military does/did use for bore and rifling specifications? I know that 50 BMG barrels are supposed to be .500 lands and .510 bore but what are the Mil-spec tolerances?
I have the opportunity to buy a factory second barrel from a very good barrel manufacturer that is .0005 small on both dimensions. I am wondering if the military would have found this acceptable.
I am not building a benchrest rifle. I am not building a benchrest rifle.
|February 13, 2014, 10:02 PM||#2|
Join Date: September 17, 2007
Location: Eastern KS
I don't know what the +\- mil-spec tolerance is.
But rest assured it is more then that.
But 5/10,000" is so small you could lap it out with bore paste on a lead slug in 30 minutes.
And I don't believe it would make any difference if you didn't.
IMO: .005" would truly be a deal breaker, but .0005" isn't.
Don't put all your eggs in one basket.
Or all your primers in a glass jar!
Last edited by rcmodel; February 13, 2014 at 10:35 PM.
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