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Old May 30, 2013, 07:48 AM   #1
Swampman1
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Case trimming

Usually when I see articles on case length trimming, it's talking about long brass. Is trimming required more for long brass than say, 9mm or 45 acp? And which case trimmer is prefered?
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Old May 30, 2013, 07:52 AM   #2
Vance
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I have found that trimming straight walled pistol cases is not needed as they don't grow during sizing.
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Old May 30, 2013, 08:19 AM   #3
AllenJ
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+1 for Vance's statement. I have never had to trim any of my 9mm or 45 ACP brass.
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Old May 30, 2013, 08:55 AM   #4
boondocker385
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Revolvers yes, pistols not necessary...
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Old May 30, 2013, 09:06 AM   #5
Brian Pfleuger
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Quote:
Usually when I see articles on case length trimming, it's talking about long brass. Is trimming required more for long brass than say, 9mm or 45 acp? And which case trimmer is prefered?
Not so much "long", more high-pressure.

Very few handgun rounds have the pressure required to make the brass grow. Most often, handgun brass actually shrinks when fired. You take a "long", skinny cylinder and make it into a fatter (chamber sized) cylinder. By necessity, absent stretching in the case web which you will not normally get with most any handgun round, a wider cylinder is shorter than it's narrower self.
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Old May 30, 2013, 09:17 AM   #6
jgn
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I have never had to trim handgun brass.but had to not use them again when they split at the top.
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Old May 30, 2013, 09:49 AM   #7
Swampman1
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OK thanks guys.

Quote:
Not so much "long", more high-pressure.
That makes sense, because the only straight walled brass I saw trimmed was 44 magnum.
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Old May 30, 2013, 10:13 AM   #8
ntg
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I keep an eye on my pistol brass (measure it once in a while, picking random cases) just in case there's soft brass in there, but haven't had an issue yet.

For rifle trimming I use the Lee trimmers. They're cheap, and do the job accurately well.
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Old May 30, 2013, 11:15 AM   #9
YunGun
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General consensus as well as personal experience also suggests that pulling the expander plug back through the mouth of the case when using traditional full-length sizing dies (especially with bottle-necked cartridges) is also responsible for a significant percentage of stretching/growth, which is one reason why neck-sizing will generally help to extend the life of your brass.
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Old May 30, 2013, 11:46 AM   #10
eldermike
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Any round that gets a crimp should be trimmed to a uniform length/per batch. If no crimp is involved with the proper loading of a pistol round then trimming is of no value.
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Old May 30, 2013, 01:41 PM   #11
David Bachelder
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I have not had to trim any straight wall pistol brass. Revolver or Semi auto.
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Old May 30, 2013, 11:34 PM   #12
joneb
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Quote:
I have not had to trim any straight wall pistol brass. Revolver or Semi auto.
I trim all my straight walled revolver brass to ensure a consistent crimp, you won't get there with out it, I'm sorry that's just the way it is, unless all of your brass is the same length ?
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Old May 31, 2013, 04:07 PM   #13
Vance
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Haven't had any problems getting a good crimp on any of my .357 mag cartridges I load into my GP100. I don't trim those cases.
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Old May 31, 2013, 04:40 PM   #14
David Bachelder
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"I trim all my straight walled revolver brass to ensure a consistent crimp, you won't get there with out it, I'm sorry that's just the way it is, unless all of your brass is the same length ?"

I don't have that problem, and I get there just fine.

OCYMMV
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Old May 31, 2013, 05:41 PM   #15
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Well I've tried it both ways and you definitely get a more consistent crimp and grouping when you trim. but it's not a necessity. kinda depends on how uniform you want your ammo to be. personally I like all my ammo as uniform as possible, wether it's for plinkin, practice or self defense.
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Old May 31, 2013, 07:31 PM   #16
farnorthdan
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Only straight wall brass I've had to trim is .30 carbine.
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