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Attention New Members and those new registering!
We had a lot of problems with spammers and bot attacks with the stock measures provided by the software. The 7 for registration was a fix that we came up with on our own that has worked quite well. Yes it is a PIA for both you and administration to put you onto your chosen username.
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Thanks for joining us from the administration.

Board index » Specialty Weapons » Japanese Firearms and Militaria

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Baby Nambu chamber specs?

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KimFella

Post subject: Baby Nambu chamber specs?

Posted: Thu Jan 03, 2019 8:53 pm

Master Sergeant

Joined: Mon Jul 23, 2012 5:14 pm
Posts: 256
Location: Oshawa

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").

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NebrHogger

Post subject: Re: Baby Nambu chamber specs?

Posted: Thu Jan 03, 2019 9:14 pm

Теперь предлагаем бесплатную ежедневную маммографию!

Joined: Sun Aug 05, 2007 9:04 pm
Posts: 11655
Location: On the couch a lot now that I'm retired

This was all I found. You've actually got one???? SW

https://en.wikipedia.org/wiki/7%C3%9720mm_Nambu

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Slava Ukraini!!

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KimFella

Post subject: Re: Baby Nambu chamber specs?

Posted: Thu Jan 03, 2019 11:00 pm

Master Sergeant

Joined: Mon Jul 23, 2012 5:14 pm
Posts: 256
Location: Oshawa

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KimFella

Post subject: Re: Baby Nambu chamber specs?

Posted: Sun Jan 06, 2019 6:24 pm

Master Sergeant

Joined: Mon Jul 23, 2012 5:14 pm
Posts: 256
Location: Oshawa

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.

Fun stuff!

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Et2ss

Post subject: Re: Baby Nambu chamber specs?

Posted: Thu Jan 10, 2019 9:22 pm

Brigadier General

Joined: Fri Aug 03, 2007 8:07 pm
Posts: 5232
Location: Far too close to the edge

Sounds like a fun project

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