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Reloading Berger Bullets

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signs of pressure

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  #1  
Unread 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  
    Unread 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  
    Unread 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  
    Unread 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  
    Unread 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  
    Unread 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  
    Unread 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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