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Yesterday's Weapons Forums :: View topic - Baby Nambu chamber specs?
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Baby Nambu chamber specs?
http://www.yesterdaysweapons.com/phpBB3/viewtopic.php?f=22&t=13695		 Page 1 of 1
Author:  KimFella [ Thu Jan 03, 2019 8:53 pm ]
Post subject:  Baby Nambu chamber specs?
Does anyone know where I can find the chamber specs and the bore & groove dia. and rifling specs for the Baby Nambu? I couldn't find anything on the SAAMI site and Google search hasn't given me much either. I did find the cartridge specs in Barnes COTW (even though on pg. 326 it lists the bullet as .283" dia. and on pgs 369 & 546 it lists the dia. as .280").
Author:  NebrHogger [ Thu Jan 03, 2019 9:14 pm ]
Post subject:  Re: Baby Nambu chamber specs?
This was all I found. You've actually got one???? SW

https://en.wikipedia.org/wiki/7%C3%9720mm_Nambu
Author:  KimFella [ Thu Jan 03, 2019 11:00 pm ]
Post subject:  Re: Baby Nambu chamber specs?
Author:  KimFella [ Sun Jan 06, 2019 6:24 pm ]
Post subject:  Re: Baby Nambu chamber specs?
I found a site that has a reamer for the Baby Nambu and they sent me an Excel spreadsheet with the drawing. (Not clear whether this is originally from some kind of "official" specs or drawn up from customer supplied cases.)

It is
Pacific Tool & Gauge

Phone:541-826-5808
Fax: 541-826-0773
675 Antelope Rd.
White City, OR 97503
http://pacifictoolandgauge.com/

They show .273 for the bore (at least I think that is what that is measuring) so maybe my guess of .277 may be too loose.

Anyway, comparing the shoulder and neck specs with the Barnes figures for the cartridge, and the rim, base, and body specs for the .223 and Tokarev chambers with the same for the cartridge specs I should be able to come to a reasonable clearance. Or, more simply, combine the base end of .223 and Tokarev chambers with the shoulder and neck specs for the .280 Nambu chamber to determine the reamer specs I'll need. :D Fun stuff! :D
Author:  Et2ss [ Thu Jan 10, 2019 9:22 pm ]
Post subject:  Re: Baby Nambu chamber specs?
Sounds like a fun project
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