9mm reloading - die question


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John3921
April 4, 2013, 04:03 PM
Reading a fair amount about reloading issues with the 9mm - particularly problems with resizing, glock bulges, etc. It occurs to me that a collet type die might solve a lot of 9mm problems - but I don't see that anyone even markets such a beastie.

I was thinking that if the die body housed a collet that was factory min or maybe nominal when closed then the taper issue and lube issue pretty much go away. The outside of the collet would be tapered and would ride inside the die body which would have a corresponding taper so that as the collet were driven into the die the collet would squeeze the brass to factory specs. Set it up so that the collet projects down 1/8" or so below the body of the die. When the collet contacts the shell plate and the brass is in place, then the collet and brass get driven into the die body. Put a 20 lb or so valve spring above the collet to push the collet back down and open to release the shell.

It doesn't seem as though that would be a whole lot more expensive than the titanium nitride carbide rings etc that are out there now.

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rcmodel
April 4, 2013, 04:08 PM
It occurs to me that a collet type die might solve a lot of 9mm problems It might.

But I have reloaded 9mm since 1970, and never had a problem.

Well, I did have one.
There is a lot of case rim variation among the 1,000 or so places that have factory loaded 9mm over the years.

I have had problems with cases fitting shell holders with some of the really weird brands.

rc

Fire_Moose
April 4, 2013, 04:23 PM
The case tapers from the rim to neck, wider at the rim. You couldn't pull the wider part if the mandrel back thru the neck....

Sent from my CZ85 Combat

John3921
April 4, 2013, 05:11 PM
I wouldn't think you'd need a mandrel - just an external collet - similar to a mec shotgun press resizing collet. Probably have to be somewhat more precise - but along those lines.

Otto
April 4, 2013, 05:20 PM
Without a mandrel the case would be sized off axis.
The best solution is to roll size (like with a Case Pro) or use a U die from EGW.
Never had a problem with 9mm brass but then I don't shoot 9mm Major or own a Glock.

ArchAngelCD
April 4, 2013, 06:23 PM
I thought it was onloy 40 S&W brass that's a problem when fired in a Glock, not 9mm.

rcmodel
April 4, 2013, 07:54 PM
I have never had a problem with .40 S&W in my Glock 23 in 18 years either.

And you won't either if you don't try to reload to 10mm performance levels.

rc

gamestalker
April 4, 2013, 10:21 PM
I'm leaning toward what RC said, in over 30 yrs. of loading 9mm I have yet to have any problems, with exception to those weird head stamps RC referenced, that don't fit the shell holder.

As for .40 cal. never had any bulging issues with that either, and I load em pretty stout too.

It seems that some re-loaders are either doing something wrong, or maybe creating non existent problems?

GS

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