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mrerick · 02-06-2018, 04:45 PM

A bottleneck cartridge should headspace on the shoulder. The SAAMI spec I pointed to earlier shows this measured to the middle of the bottleneck shoulder.

It might be that someone took a 9mm reamer to the normally tapered chamber of a .30 Luger chamber... The chamber should be .3918 inches where the thick web of the case ends and .3805 at the start of the shoulder.

I'm only speculating without a cast of the chamber or good photos.

02-06-2018, 04:45 PM	#22
mrerick Super Moderator - Patron LugerForum Life Patron Join Date: Dec 2009 Location: Eastern North Carolina, USA Posts: 3,924 Thanks: 1,377 Thanked 3,136 Times in 1,519 Posts	A bottleneck cartridge should headspace on the shoulder. The SAAMI spec I pointed to earlier shows this measured to the middle of the bottleneck shoulder. It might be that someone took a 9mm reamer to the normally tapered chamber of a .30 Luger chamber... The chamber should be .3918 inches where the thick web of the case ends and .3805 at the start of the shoulder. I'm only speculating without a cast of the chamber or good photos. __________________ Igitur si vis pacem, para bellum - - Therefore if you want peace, prepare for war.