9mm luger case trimming

HJ857 · May 9, 2007, 03:38 PM

I've read a number of posts that indicate that trimming is basically not necessary. So, just looking for a definitive answer - do I need to worry about trimming cases or will they split before needing a trim?

I'm just starting to load 9mm luger and only producing target rounds that are close to or exactly starting load specs. Using 124g fmj and WSF powder.

Thanks all.

30Cal · May 9, 2007, 03:44 PM

Trim 9mm? No.

CrustyFN · May 9, 2007, 09:14 PM

You don't need to trim straight wall pistol cases. Shoot them until you lose them or they are no good.
Rusty

ECLIPSE45ACP · May 14, 2007, 05:56 AM

agreed, spend time doing more useful things than trimming 9mm cases.

Crosshair · May 14, 2007, 12:32 PM

One more vote for not trimming the 9mm. Straight wall cases that use carbine dies just don't grow enough to worry about it.

Shoney · May 14, 2007, 12:54 PM

Do 9mm Luger cases need to be trimmed? As has been clearly stated - -NO! They actually get shorter over many sucessive loadings.

Trimming of cases is primarily a rifle case proceedure. The repeated shooting and sizing of bottleneck cases will cause the brass to stretch.

Various rifle cases have min and max trim lengths listed in most loading manuals. The amount of stretch per case varies because of many factors, and therefore the number of loadings between trimming varies. Exceeding the max case length in rifles will cause either hard chambering or failure of bolt to close on the cartridge.

HJ857 · May 14, 2007, 01:17 PM

Thanks all. I appreciate the insights.

May 9, 2007, 03:38 PM	#1
HJ857 Senior Member Join Date: January 9, 2007 Posts: 447	9mm luger case trimming I've read a number of posts that indicate that trimming is basically not necessary. So, just looking for a definitive answer - do I need to worry about trimming cases or will they split before needing a trim? I'm just starting to load 9mm luger and only producing target rounds that are close to or exactly starting load specs. Using 124g fmj and WSF powder. Thanks all.

May 9, 2007, 09:14 PM	#3
CrustyFN Senior Member Join Date: June 4, 2006 Location: West Virginia Posts: 2,258	You don't need to trim straight wall pistol cases. Shoot them until you lose them or they are no good. Rusty __________________ I don't ever remember being absent minded.

May 14, 2007, 05:56 AM	#4
ECLIPSE45ACP Senior Member Join Date: January 9, 2007 Location: Omaha, NE Posts: 177	agreed, spend time doing more useful things than trimming 9mm cases. __________________ GLOCK 17 9MM KIMBER ECLIPSE CUSTOM II .45 ACP COLT PYTHON 6" STAINLESS .357 MAGNUM "SPEAK SOFTLY AND CARRY A BIG GUN!"

May 14, 2007, 12:32 PM	#5
Crosshair Senior Member Join Date: December 16, 2004 Location: Grand Forks, ND Posts: 5,333	One more vote for not trimming the 9mm. Straight wall cases that use carbine dies just don't grow enough to worry about it. __________________ I don't carry a gun to go looking for trouble, I carry a gun in case trouble finds me.

May 14, 2007, 12:54 PM	#6
Shoney Senior Member Join Date: February 21, 2002 Location: Transplanted from Montana Posts: 2,311	Do 9mm Luger cases need to be trimmed? As has been clearly stated - -NO! They actually get shorter over many sucessive loadings. Trimming of cases is primarily a rifle case proceedure. The repeated shooting and sizing of bottleneck cases will cause the brass to stretch. Various rifle cases have min and max trim lengths listed in most loading manuals. The amount of stretch per case varies because of many factors, and therefore the number of loadings between trimming varies. Exceeding the max case length in rifles will cause either hard chambering or failure of bolt to close on the cartridge. __________________ I pledge allegiance to the Flag - - -, and to the Republic for which it stands….Our Forefathers were brilliant for giving us a Republic, not a democracy! Do you know the difference??? and WHY?http://www.wallbuilders.com/LIBissue...les.asp?id=111

May 9, 2007, 03:44 PM	#2
30Cal Senior Member Join Date: December 3, 2002 Posts: 1,264	Trim 9mm? No.

May 14, 2007, 01:17 PM	#7
HJ857 Senior Member Join Date: January 9, 2007 Posts: 447	Thanks all. I appreciate the insights.