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#5655218 - 03/17/15 02:58 PM Various case lengths
4fingerpete Offline
Woodsman

Registered: 01/19/12
Posts: 147
Loc: Fort Worth, TX
I recently picked up quite a bit of 9mm range brass. After cleaning and resizing I found that the case lengths ranged anywhere from .738-.750. All of my manuals suggest trim size is .750

Should I trim down all the brass to the shortest one so I get a consistent crimp?

On another note I Googled my problem and came across a forum where people were saying that if you have to crimp your pistol brass then you have your dies set up wrong... any truth to this?

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#5655308 - 03/17/15 04:15 PM Re: Various case lengths [Re: 4fingerpete]
ChadTRG42 Online   happy
THF Celebrity

Registered: 09/16/09
Posts: 11659
Loc: Lewisville, TX
I'm showing a .754" as max case length. So, you are under the max length. I would just load them up and go. I would never trim a 9mm case, ever. It's not worth it, and the cases are plentiful. Plus, the chamber will allow a little more than a .754" case length anyway. Just load them up and go. On the crimp, the 9mm round, as well as many other non-bottle neck cases head space on the case shoulder, so a crimp is normally not needed. If you do crimp, it will be a taper crimp, not a roll crimp. I would not crimp.
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#5655352 - 03/17/15 04:40 PM Re: Various case lengths [Re: ChadTRG42]
PrimitiveHunter Offline
THF Celebrity

Registered: 10/09/06
Posts: 10160
Loc: Whitesboro
Chad...check your PMs.
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#5705168 - 04/17/15 02:35 PM Re: Various case lengths [Re: 4fingerpete]
wrknonit Offline
Bird Dog

Registered: 06/23/11
Posts: 321
Loc: Ingram, Texas
Keep in mind that 9mm headspaces off the case mouth so be consistent as possible for best results. and i dont crimp 9


Edited by wrknonit (04/17/15 02:36 PM)
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