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Pressure signs

 
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  #1  
Old 06-07-2010, 02:02 PM
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Pressure signs

I am having a bit of trouble with a recent load I developed for my 7mm WSM 160 accubonds. I am shooting 60.5 grains of IMR 4831, and .005 jump. I am seeing some signs of pressure (cratered firing pin strike, primers might be flattening a very small amount, and a very slight impression of the extractor). I would like to still keep up my velocity, and suggestions. I was thinking about backing off of the lands a bit.
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Old 06-07-2010, 02:16 PM
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Re: Pressure signs

Sounds a bit hot. If you do back off the lands it could reduce the pressure a bit. But as you do you will also be taking up case volume space with the deeper seated bullet and that could offset it. If you are seeing pressure like you are describing, I would suggest backing off a grain or two. You may even find better acuracy. I will take that to velocity any day. If you feel you have to have the velocity then I would look at changing powder and working up again. You may even find a load with better velocity that will save your rifles throat and make your case life better.

JMO
Jeff
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Old 06-07-2010, 07:47 PM
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Re: Pressure signs

+1 to broz.

Are you sure your primers are actually showing a sign of pressure? I have several guns that have craters in the primers with light loads and factory loads. also the ejector marks are very common. Just saying make sure what you are seeing is not common to your rifle.
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Old 06-07-2010, 08:53 PM
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Re: Pressure signs

Here is a picture of the last two cases that were shot.
Extractor marks on the left case is on the E and R, on the right is on the W in WSM.
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Old 06-07-2010, 09:07 PM
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Re: Pressure signs

I cant tell for sure but they do not look the same. the one on the left looks like it has more of a crator? is that right? If so I have never had a rifle do that inconsistently so it could be a pressure sign. Measure the case head and see if you have any head expansion. Also deprime and measure your primer pockets. if they measure more than .2085 they are too big and you have too much pressure. .2085 is the absolute max before your primer pockets are too loose.
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Get a JOB! I already feed the bears, I dont need to feed you too!

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  #6  
Old 06-07-2010, 09:43 PM
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Re: Pressure signs

The one on the left does have the worse signs of pressure. Primer pockets are exactly .2085. This is about the third go around with this brass as well. These loads are also fairly consistent in velocity ES 20 fps and grouping 1/2 in so I would like to keep it. That is why I am considering just backing my bullets .015 off the lands instead of .005
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  #7  
Old 06-07-2010, 10:06 PM
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Re: Pressure signs

Greener280

I have a remington sendero in 300rum that craters the primers no matter how hot of a load i shoot. I am pretty sure that the firing pin hole is to large for the pin and get flow back. Just wondering if yours is the same way.
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