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Liquid Body jewelry Fluid Finger Thumb

So I'm trying to trim my 9mm brass and before you say it I have already been told that you don't "have" to trim 9mm. My length gauge keeps getting stuck in my brass and then when I provide firm pressure I get this result and the gauge gets stuck in the brass. Thoughts?
 

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Thoughts are head space and operator timing :p
I got to ask though why are you trimming 9mm or any pistol brass
Unless your being a cheap butt and trying to trim it down to 380


Also trimming before or after sizing?
 

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I don't think I have ever trimmed 9mm brass, rifle cartridges yes, as they tend to grow, but not 9mm as I have experienced.
 

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It looks like you are using the Lee case length guage and trimmer. Try running the brass through the expanding die after resizing and then use your length guage/trimmer. The sizing die reduces the case mouth to slightly undersize and the expander die opens it to the proper inside diameter to accept a bullet or in this case the pilot portion of the case length guage.
 

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I certainly see a good reason for trimming pistol brass, if your goal is accuracy. The 9mm, etc., headspace on the case mouth. When you load to a specific OAL and your case lengths vary then the distance from the bullet to the lands varies too. Also your crimp will vary. It might be nit-picky but it could make a difference in accuracy. I trim all and any new brass intended for accuracy loads for consistency's sake. You shouldn't have to trim handgun brass any more after the first time.
 

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Yes, if you're shooting bullseye or something, there may be a good reason to trim pistol brass.

Someone mentioned trimming after the expander die, and that's what I've done when I wanted to try to make some super-uniform-and-accurate 45 loads. Worked out just fine.

For the record, I've never trimmed 9mm brass either, but again YMMV.
 
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