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I need help with pressure problems

 
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  #8  
Old 05-05-2012, 12:44 AM
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Re: I need help with pressure problems

Lube left on the case or some solvents in the chamber can cause this.

Is it posssible to post a pic of the case head showing the extracor swipe?
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  #9  
Old 05-06-2012, 02:25 AM
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Re: I need help with pressure problems

Quote:
Originally Posted by yawn View Post
Lube left on the case or some solvents in the chamber can cause this.

Is it posssible to post a pic of the case head showing the extracor swipe?
Ok I have taken a few measurements (with pictures...I know how you guys like pictures)
The first is for the neck measurements. I read 5 fired cases and they all read the same so I zeroed on one of them and here is what I got:

Next I have an innovative technologies bad ass headspace guage. Looks like I have exactly .006 clearance between new brass before it is fired.

And finially I have pictures of the case heads. It is not easy to get the swipe to photograph y but you can see the circle.
First(right to left) 36g 2000MR....2577fps
39.5g 2000mr......2760
41.5g 2000MR......2942

I do realize that solvent and or lube can cause problems but this is not what's going on here. Also the rifle has been cleaned by the letter of the law...no copper build up or other cleaning related issues.

Notice in the pictures the primers do not really show any issues...but with circles and heavy bolt(but like I mentioned slightly heavy on the close) it has me confused...
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  #10  
Old 05-06-2012, 02:59 AM
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Re: I need help with pressure problems

It's quite possible that you have a soft batch of brass, it does happen, even with high end manufacturers.

Looking at your case pics, they all look similar, which is why I suggested you may have a soft lot of brass, if it was only at the high end then I would think it was the load only.

I have a question: How far from/into the lands are you loading?

Loading into the lands can also raise pressures dangerously from starting loads.


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  #11  
Old 05-06-2012, 08:59 AM
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Re: I need help with pressure problems

I agree that in the photos the ejector mark looks the same, but with the naked eye, the warmer loads are more evident. You have to look for the mark on the lighter loads.

I'm not sure that the brass is soft though because I ran them all over a manderal(sp) die and still had to lube the bullets a little to get them to seat without cutting a ring where the stem made contact. I'm using a Wilson seater. Maybe the brass is to hard?

I'm jumping .005
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  #12  
Old 05-07-2012, 04:57 PM
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Re: I need help with pressure problems

Quickload suggests your 36gr H4350 load would be ruining about 43500 psi.,your brass seems to think otherwise though. I think Id try some different brass first maybe some one could donate a few pieces that are proven?, It may be a slow barrel but thats getting a bit ridiculous.
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  #13  
Old 05-07-2012, 07:18 PM
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Re: I need help with pressure problems

I doubt it's a brass problem, if an issue at all(might not be).
There are still basic measurements to make that can't be generalized or assumed.
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  #14  
Old 05-08-2012, 06:39 PM
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Re: I need help with pressure problems

Mike, I thought I made the measurements you suggested but missed the one for the webb. Maybe you could explain this and anything else i need to measure. thanks
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