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sadsack · March 13, 2009, 03:21 AM

Bird: The max inside diameter for the thinwall 12 ga is .728, and the outside diameter must be .040 over the bore diameter to be safe(that would allow .020 wall thickness). Brownells lists .015 as absolute minimum wall thickness, but I feel safer at .018. (thinwall threads are .774)

March 13, 2009, 03:21 AM	#4
sadsack Senior Member Join Date: February 4, 2006 Posts: 206	Bird: The max inside diameter for the thinwall 12 ga is .728, and the outside diameter must be .040 over the bore diameter to be safe(that would allow .020 wall thickness). Brownells lists .015 as absolute minimum wall thickness, but I feel safer at .018. (thinwall threads are .774)