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signs of pressure

 
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  #1  
Old 05-08-2010, 10:19 PM
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signs of pressure

just fyi
I have been shooting 64.5 gr of 4831 under 168 gr bergers
for about three months now with no problems no hint of pressure signs
but the temp has never got above 60 and was cloudy most of the time
today was sunny up around 70
and had Major pressure signs bolt extremly hard to lift primmer flat
So ill be backing hte load down to 63 gr to where i started.
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  #2  
Old 05-09-2010, 02:26 AM
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Re: signs of pressure

Which caliber and cartridge? IMR or Hodgdon 4831 powder?
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  #3  
Old 05-09-2010, 06:50 AM
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Re: signs of pressure

opps sorry
7mm rem mag
hodgen powder 4831sc
in a new remington sendero
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  #4  
Old 05-09-2010, 06:54 AM
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Re: signs of pressure

opps sorry
7mm rem mag in a new sendero
using winchester brass and primers
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  #5  
Old 05-09-2010, 09:21 AM
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Re: signs of pressure

Same powder lot ? Seems a little excessive over a 10 degree temp movement for a Hodgdon extreme powder.
I use some of the other powders that they have listed as the Extreme powders and I can go from below 0 to 80 degrees with a maxxed out load with no problems at all.
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  #6  
Old 05-09-2010, 10:10 AM
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Re: signs of pressure

I've also had pretty good luck with the extreme powders being stable . it seems like 90* F is where sensitivity starts to happen .
was your ammo setting in direct sun ? or getting baked in the car ? if so this could be your problem . try keeping your ammo in the shade .
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  #7  
Old 05-09-2010, 01:09 PM
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Re: signs of pressure

Sounds like it could be 1 of 2 things.

1: A different lot of powder.

2: A slightly worn (erroded) throat. This will cause friction on the bullet driving up the pressure.
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Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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