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8mm Nambu rim trim

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8mm Nambu rim trim

#1 Post by rickplayer » Wed Nov 01, 2017 12:29 am

Does anybody have a method to trim the thickness of formed .40 S&W so it is closer to nambu specs?

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Re: 8mm Nambu rim trim

#2 Post by Rapidrob » Wed Nov 01, 2017 10:57 am

Yes,but it is slow. Years ago I made a rounded tapered mandrel that would fight tightly in the casing. The mandrel was then placed in a drill press at moderate speed and Swiss needle files used to shape the rim.
I've since gotten a used Harbor Freight Mini-Lathe and using the same case holding mandrel,shape the rim. 10 times faster and better,consistent results.
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Re: 8mm Nambu rim trim

#3 Post by rickplayer » Thu Nov 02, 2017 12:47 am

Sounds expensive

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Re: 8mm Nambu rim trim

#4 Post by RWS » Thu Nov 02, 2017 6:15 am

If you wanna shoot your 8mm Nambu then it's either gonna be easy and expensive or cheap and tedious. You are well advised to thin the rim on .40 S&W brass. I destroyed a perfectly good Nambu extractor with unaltered .40 S&W cases rims.

In my humble opinion, just buy 100 of the Huntington cases and go from there. Yes, at $73 per hundred cases they are a tad pricey but you only cry one time and the low pressure of the 8mm Nambu round means that you can get bunches of reloads out of a case before it gives up the ghost. Grafs has the cases (currently in stock):
https://www.grafs.com/retail/catalog/ca ... goryId/500?

Because once-fired .40 S&W cases are so plentiful and free, I so much wanted them to work but they just won't function in my Nambu pistol without modifying the rims, and unlike Rob I can't stand the tedious nature of the work. Plus, the amount of rim work I was doing, when compared to the price of the Huntington brass, meant that I was paying myself something like $2 an hour to endure the tedium of the case prep. Not for me. I highly suggest you just bite the bullet and buy factory cases. YMMV.

One final thought... If you are concerned about the expense then you are not gonna like the price for either a set of 8mm Nambu dies or the odd diameter bullets they require. Sadly, no matter how you slice it Nambu pistols are just more expensive to reload for than either 9mm Luger or .40 S&W unless you cast your own bullets.

-Bob

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Re: 8mm Nambu rim trim

#5 Post by rickplayer » Mon Nov 06, 2017 12:12 am

I hear you. I have the dies etc, it just seemed the lathe was a bit expensive. I was hoping for a cool garage fix for thinning the rims. I probably will buy a mini lathe. I love my nambu.

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Re: 8mm Nambu rim trim

#6 Post by Rapidrob » Mon Nov 06, 2017 8:49 am

Try the drill press/mandrel. One piece needed you make. Doesn't get easier than that unless you buy the brass.
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Re: 8mm Nambu rim trim

#7 Post by Rapidrob » Mon Nov 06, 2017 9:03 am

Contact LEE engineering and order this https://leeprecision.com/326-decapper.html. It's 4 bucks. Chuck it in you drill or drill press and file down your rims. Easy Peasy
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Re: 8mm Nambu rim trim

#8 Post by rickplayer » Fri Nov 10, 2017 1:35 am

I ordered one.

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Re: 8mm Nambu rim trim

#9 Post by rickplayer » Mon Nov 13, 2017 10:20 pm

That worked perfectly!!!!!!!

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Re: 8mm Nambu rim trim

#10 Post by Rapidrob » Mon Nov 13, 2017 10:34 pm

Cool Beans! I like simple.
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Re: 8mm Nambu rim trim

#11 Post by S.B. » Sun Nov 19, 2017 9:56 am

I found some 8mm Nambu brass(50) just to shoot mine but, only shot it a few times. Too
afraid of loosing brass in grass! Very expensive endeavor!
Steve

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