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What caused my case to do this? (Help)

 
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  #8  
Old 10-10-2011, 09:50 PM
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Join Date: Oct 2007
Posts: 880
Re: What caused my case to do this? (Help)

How accurate is your scale? Next time you load, throw one or two of those 210 bergers on the scale. They are as good a divice as any to check your scale's accuracy.

Just a thought.
Good luck
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  #9  
Old 10-13-2011, 12:42 PM
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Join Date: Apr 2008
Posts: 31
Re: What caused my case to do this? (Help)

It's likely from slight gas leakage due to a low chamber pressure. If the case is headspacing on the belt rather than the case shoulder there can be some space betwen the case shoulder and chamber. A low pressure load will not cause the case to expand enough and completely seal the chamber.

Hope you find your solution.
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  #10  
Old 10-13-2011, 06:50 PM
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Join Date: Dec 2005
Posts: 35
Re: What caused my case to do this? (Help)

It appears to be a classic situation of excessive case
lube (RCBS specifically), when resizing one's brass.
One of the many reasons I quit using this type of
sizing lube decades ago! For the last ten years or
so, I've been using sizing wax, which works perfectly
and cleans up easily.

I've never seen this as an aftermath of being fired:
being chambered looking perfect and coming out of
the chamber looking like this.

But since you didn't specify when this happened, and,
just in case it showed up after being fired, I'd suggest
it would be a result of anything caught in the chamber
between the loaded cartridge and the barrel's chamber.
Not having anywhere to go, it stayed put and dented the
cartridge case.
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  #11  
Old 10-20-2011, 02:37 PM
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Join Date: Oct 2011
Location: Sun City, Arizona
Posts: 191
Re: What caused my case to do this? (Help)

new guy here and first post.
i believe it's too much freebore also. just like everyone one else, gases are escaping around the neck-shoulder area. i would check case length after sizing and check COL. maybe seat the bullets out a little further if you can safely!

those dents are not due to over lubeing. they would have blown out after shooting.

good luck.
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  #12  
Old 10-20-2011, 03:27 PM
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Join Date: Apr 2010
Location: Allen, TX
Posts: 2,608
Re: What caused my case to do this? (Help)

While it may be more common with lots of freebore, that's not the cause of the condition. Like Broz stated, it's caused by not sealing due to an insufficient powder charge.

The other condition that would cause this is if there are any flakes or grains of unburned powder in the chamber when the cartridge was fired. ...like from having a bullet pull loose and spill powder in your chamber and magazine. (Just don't ask how I know about that. )

-- richard
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  #13  
Old 10-20-2011, 05:06 PM
Silver Member
 
Join Date: Oct 2011
Location: Sun City, Arizona
Posts: 191
Re: What caused my case to do this? (Help)

Quote:
Originally Posted by rscott5028 View Post
While it may be more common with lots of freebore, that's not the cause of the condition. Like Broz stated, it's caused by not sealing due to an insufficient powder charge.

The other condition that would cause this is if there are any flakes or grains of unburned powder in the chamber when the cartridge was fired. ...like from having a bullet pull loose and spill powder in your chamber and magazine. (Just don't ask how I know about that. )

-- richard

i will respect your wishes and not ask how you know (we all have our little secrets). i see a load for it being 99-104 grns of H1000 and see that the problem may be too light a load.
i have learned something today that i have never encountered. thank you.
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  #14  
Old 10-20-2011, 10:59 PM
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Join Date: Sep 2010
Location: Coldwater michigan
Posts: 507
Re: What caused my case to do this? (Help)

Quote:
Originally Posted by Nimrodmar10 View Post
The same thing has happened on smy 7 RUM. It's caused by the freebore that Weatherby and by Remington in it's Ultra Mag shells. They have lots of freebore like the Weatherby. It has something to do with the seating depth of the bullet and the freebore allowing gas to bypass past the neck which does not seal With mine it was with a Berger 180 gr. VLD. I'm guessing you were using a VLD also.

I would think and this mho, if there was gas leakage wouldn't the indents be darkend a little like it is around the case mouth? And why would the shoulder be unharmed and the dents appear after (behind) the shoulder?
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