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Reloading Techniques For Reloading


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No signs of over pressure?????

 
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  #8  
Old 05-05-2013, 02:17 PM
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Join Date: Mar 2013
Location: Scotland
Posts: 9
Re: No signs of over pressure?????

Quote:
Originally Posted by jasent View Post
If your velocity has flattened out and does not increase with charge increase it may just be that your gun with that combo is unable to burn more powder. Could be that the bullet is leaving the gun before all the powder is burned. So it can't get the higher speed or pressure you where watching out for. I'm surprised you did not break 3000 fps with it, I shoot 185gr Berger's at 3050 with no pressure signs. I see pressure at around 3100. my barrel is only half inch longer than yours
Hi there thanks for your replies. Yeah I thought I'd get to 3000 a fair bit easier.
Have noticed some of my cases that took the higher charges in load development 75.5gr are loose in the primer pocket.
What powder are you using and how many grains just out of curiosity?
Think maybe the baring surface of the Bergers is possibly a bit shorter than that of the Amax making the Amax slower??
Am happy loading at 74 now get really steady MV at 2947 average. Shot 3 three shot groups the other day at 510 yards the furtherest I've ever shot and the worst was 5 1/2"and the best 2" was just about 6" low so think my drop data might be a little out.

Thanks again guys
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  #9  
Old 05-05-2013, 03:36 PM
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Join Date: Dec 2005
Posts: 2,113
Re: No signs of over pressure?????

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Originally Posted by lever-hed View Post
You have to take into consideration that cartridge has several bearing points, from case wall, to the belt, to bolt face, and if the cartridge has room to move around, that movement will ‘absorb’ a lot of the pressures. when you have all of or most of the pressures bearing in the shoulder-bolt face combination, you may begin to see over-pressure signs and these can occur, and do occur rapidly when they do , just when you have the least attention on it.
This is really strange. Especially when every round fits the chamber pretty much the same way when fired. And the pressure builds up in all directions the same amount; same pressure's everywhere inside that case. So it's all pressing against the chamber wall and bolt face the same all over.

If the uneven case surface was able to "absorb" pressures, then all those pressure reading's from strain gauges put at one point on the barrel would not be reliable. One would have to add what pressure was "absorbed" by the case under the strain gauge to the pressure reading it had to be correct. What method would be used to measure how much pressure was absorbed by the cartridge case?
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  #10  
Old 05-05-2013, 08:06 PM
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Join Date: Nov 2010
Location: deer park, wa 99006
Posts: 123
Re: No signs of over pressure?????

I'm burning 74.5 gr of reloader 22 with cci 250's. I tried imr7828 but didn't get the accuracy I was wanting. with this load im getting 1/2 moa out to 500 sofar.
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