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Old July 12, 2005, 10:27 AM   #1
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Trim pistol cases?

Trim pistol cases
Until yesterday I had not trimmed a pistol case in 20 years.
I bought a Ruger PS-101 [.357 Magnum]and AM having trouble getting the cylinder to rotate. I started measuring case lengths. What an over size mess. I then went to a batch of 100 new Winchester .357 brass. Their new, unfired brass measurement was from .0003 to .0007 too long. Seven thousands over-size? I have trimmed over a hundred cases and will load them and see if that solves the little revolver's problem.
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Old July 12, 2005, 12:07 PM   #2
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Hummm, do you have another .357? Do they fit there? Sounds like the cylinder is squirley. Have you measured the cylinder compaired to factory specs? Interesting. I have never trimmed straight walled pistol cases except in experimenting with 35 wheelen spitzer bullets in my .357. I found the brass gets shot out (or lost) before I need to trim.
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Old July 12, 2005, 02:16 PM   #3
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If you use alot of HEAVY roll crimps, it exentually does become necessary to trim. Thats why i tend to like taper crimps more...even for revolver cartridges as your brass lasts ALOT longer.
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Old July 12, 2005, 06:17 PM   #4
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I have a hard time believing that a case that is .0003 to .0007 is causing any "length" problems. look at a micrometer and see how small that really is. the problem is elsewhere.
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Old July 12, 2005, 08:04 PM   #5
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You have one too many zeros in there for thousandths, your measurement as typed is ten-thousandths of an inch. .0007" is about a tenth the thickness of a hair that you pull out of your head to look at when you read this. It isn't enough to make a difference.

If your reading was in thousandths and typing was in error it still isn't enough to cause a problem.

My guess is primers high and dragging on the recoil shield or headspace too tight causing the caseheads to drag on the recoil shield if it is hard to turn when loaded but not fired.

One other likely candidate is that your crimp is aggressive and the cases are slightly bulging, letting them not seat fully, this will cause the caseheads to drag on the recoil plate and make it hard to turn. Usually when fired the bind will release if the next round isn't bulged.
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Old July 12, 2005, 08:06 PM   #6
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+1 (HSmith post)

Good shooting and be safe.
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Old July 14, 2005, 07:54 AM   #7
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I did have a Smith & Wesson 625 .45 ACP with a out of spec. cylinder that had to be replaced. Same problem but very rare. Most likely some error in reloading.
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Old July 14, 2005, 03:18 PM   #8
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do you have other .357's?

I have other .357's and all the bullets drop rite in.
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Old July 18, 2005, 11:45 PM   #9
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If the brass you bought is in bulk, according to the manufacturers, you are supposed to full length resize, and trim the cases before use. I have used and still use bulk pack cases, and they do vary in length and concentricity of the case mouth.
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