Trimming Pistol Brass? [Archive] - Glock Talk


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04-26-2011, 13:07

04-26-2011, 13:11
IMO, you never need to trim semiauto rounds, they just don't stretch enough. The straight wall cases will stretch, more with higher pressures. You don;t need gauges, just use your calipers.

04-26-2011, 13:14
Pistol brass doesn't grow as does rifle brass so it is an uncommon situation indeed that you'll ever have to worry about trimming.

There are those who argue that cases headspacing on the case mouth must be precisely a certain length, nothing could be further from the truth. Measure 10 brand new .45 cases, you probably won't find three that are the same length.

Just load 'em and have fun.


04-26-2011, 13:43
No, but hell no. Rifle is bad enough. Maybe that is why I don't shot very much of it anymore.

04-26-2011, 14:29
Thank You All....... I just don't have the money to waist if I don't need to..........

04-26-2011, 14:34
Pistol = Semi Auto = 1911/Glock/etc.

Revolver = 686/GP100/etc.

So nearly no one trims Pistol. Some people do trim revolver. Especially in higher power loads.

04-26-2011, 18:07
I have never had to trim straight walled pistol brass. I would not worry about it.

04-26-2011, 18:19
The only time I trim pistol brass, is the few times I get new brass. That happens with 357Maximum and 30Carbine. Not too much of that to be found at the range; so I comes to me new.

New brass has to be checked for a clear flash hole (I've found them with no flash hole, or with the chad still in the hole) and for length. You be surprised how out of spec new brass can be.

There are times when I would give a new batch of brass a quick check. Lyman makes an EZ guage that makes checking very fast. Most are fine; but occasionally, you find a long one. Trim it once, and you don't have to worry about it again. On roll crimp rounds, it affects the crimp, on taper crimp rounds, it affects headspace.

04-26-2011, 18:32
trimming pistol brass is right up there with cleaning out primer pockets.

04-26-2011, 18:37
trimming pistol brass is right up there with cleaning out primer pockets.

Is that another way of saying you're lazy? :dunno:


04-26-2011, 19:54
I've measured hundreds of used 9mm brass and only found one that was too long. I assume something was missed in the factory, but it had still worked. I just tossed it out rather than trim.