really weird chambers

Jerry Harris · 06-06-2004, 09:40 PM

Sieger,you asked why .358 inch grooves were used with .354 inch projectiles.

My Luger (1918 DWM) is stamped 8.82mm (.348 inch) on barrel, which I believe indicates diameter across lands. If so, there would be .354-.348=.006 inch diametral engagement in grooves. Isn't that OK? Are you thinking the displaced metal should completely fill the grooves? Wouldn't that be a poor idea in view of inevitable tolerance ranges and possibility of jamming?

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06-06-2004, 09:40 PM	#12
Jerry Harris User Join Date: Jun 2002 Location: Central Ohio Posts: 64 Thanks: 0 Thanked 0 Times in 0 Posts	Sieger,you asked why .358 inch grooves were used with .354 inch projectiles. My Luger (1918 DWM) is stamped 8.82mm (.348 inch) on barrel, which I believe indicates diameter across lands. If so, there would be .354-.348=.006 inch diametral engagement in grooves. Isn't that OK? Are you thinking the displaced metal should completely fill the grooves? Wouldn't that be a poor idea in view of inevitable tolerance ranges and possibility of jamming?