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338 Edge Pressure Signs

 
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  #1  
Old 04-16-2009, 01:54 AM
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Location: Spring, TX
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338 Edge Pressure Signs

I have a question for all you Edge guys. I finally finished my Edge build, and am very excited about the potential of this weapon. I have begun my normal barrel break-in routine of 1 shot clean, 1 shot, clean for about 20 rounds, and then 3 shots, clean for another 15 rounds. I'm using Rem 300 UM brass, Federal mag primers, 92 grns of H-1000 with the 300 SMK. COAL 3.77, which is all my Wyatt’s box mag will hold. The problem is, about every 5 or 6 shots, I completely flatten a primer and crack a case. What's the deal with that? From scanning this site, religiously, I concluded that 92 grns of H-1000 should be fine with the 300 SMK, but it seems to be "too hot" for my rig. Maybe I have a defective batch of brass. Do any of you guys have any suggestions?

Thanks in advance.

Smrkovsky
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Old 04-16-2009, 02:44 AM
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Re: 338 Edge Pressure Signs

What is your velocity? I know that Dogdinger's Edge shoots faster than mine and will get a sticky bolt lift before mine will. I'd definitely run it over a Chrony and see what is happening. Probably back off a grain as well until I got it figured out. AJ
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Old 04-16-2009, 03:33 AM
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Re: 338 Edge Pressure Signs

Where is the crack? Neck I assume? Did you anneal the necks before sizing up and after? What did you use to size up with? First I have heard of this as I shoot the standard load as well from both 300 and 375 RUM brass. For sure shoot over a crony. I would hope a solution will present it's self to you.

Good luck should be a sweet shooting gun.
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Old 04-16-2009, 04:28 AM
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Re: 338 Edge Pressure Signs

The crack is approx 1/2" above the base of the case, almost all the way around. Going off memory, the load chronographed around 2800-2825 fps.
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Old 04-16-2009, 06:00 AM
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Re: 338 Edge Pressure Signs

Quote:
Originally Posted by smrkovsky View Post
The crack is approx 1/2" above the base of the case, almost all the way around. Going off memory, the load chronographed around 2800-2825 fps.
That is a bit faster than either of the Edge's I've worked with are chrono'ing for the same load. Our longest barrel is 28". If you have a 30" barrel, that speed is right in there for the load. In my opinion, you are on the hot end for your rifle. My rifle runs 2750 with that load in a 28" barrel. Is this new brass, has it been fired in a 300Rum before you necked it up?

AJ
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  #6  
Old 04-16-2009, 06:19 AM
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Re: 338 Edge Pressure Signs

That load is the same I use in my 30 " barrel at 2834. The load looks hot on paper to me for the shorter barrel ? What variation spread are you getting on average from round to round ? You may be getting an odd hot one that is causing the grief if you are not in single figure or low teen fps spread ?

Other than whats already been said, I ain't got no more ideas !

DUH
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  #7  
Old 04-16-2009, 11:21 AM
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Re: 338 Edge Pressure Signs

I'm stumped. It is the same load I use out of 30" Pac-Nor=2890 fps for me and have not noticed any pressure. Is the brass new? If it is not the brass and your loads are correct I would have it checked out by whoever built the riffle or a knowledgeble smith.
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