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Polishing a body die?

 
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  #8  
Old 08-11-2013, 11:22 AM
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Re: Polishing a body die?

Quote:
Originally Posted by jsthntn247 View Post
Trimmed brass measures 2.007 after firing it is 2.017. It's growing 10 thou with only bumping .001??
Every .308 Win case I've fired has been shorter (head to mouth) by about .003" after firing. But they do lengthen almost .004" after full length sizing bumping the shoulder back about .002"; they grow near .001" each time. This is with standard SAAMI spec chambers and across 6 different full length sizing dies.

Both my 30 caliber magnums did the same thing except about .001" more, probably due to a bigger case.

So, I think you rifle chamber may be a bit on the big size. Is it a factory chamber?

What cartridge is this happening with?
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  #9  
Old 08-11-2013, 12:13 PM
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Re: Polishing a body die?

It's a 308. Load is 45.4 Varget, Lc LR brass, 155 sierra palma bullets. It's a match gun chambered with 95 palma reamer. I anneal after each firing.
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  #10  
Old 08-11-2013, 12:21 PM
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Location: Casselberry, FL
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Re: Polishing a body die?

Don't worry your cases that need trimming. It's perfectly normal for 50,000 PSI to stretch your brass. Just trim your cases to the recommended Trim to Length, and make sure your handloads have about - .001" clearance at the shoulder.

Adjust your die height accurately, and the case diameter will be fine.
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  #11  
Old 08-11-2013, 12:54 PM
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Re: Polishing a body die?

Thanks Larry. Your collet dies work well on my magnums also.
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  #12  
Old 08-11-2013, 01:39 PM
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Re: Polishing a body die?

jsthntn247 .........

One exception to my last post is when reloading belted magnum calibers. After a few reloadings, the brass above the web gets thin enough to bulge. If the brass is allowed to get too thin it will crack and separate the head.
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  #13  
Old 08-11-2013, 04:27 PM
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Re: Polishing a body die?

Quote:
Originally Posted by larrywillis View Post
It's perfectly normal for 50,000 PSI to stretch your brass.
when fired?
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  #14  
Old 08-11-2013, 05:11 PM
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Re: Polishing a body die?

Barb B ..........

??? I'm not sure what you mean.

I was referring to what happens when a case is fired. The stretching of your overall case length is normal as brass migrates forward from chamber pressure.

Excessive case stretching is avoidable by minimizing the shoulder clearance that your handloads have in your chamber.
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