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Load development in 80 + degrees

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  #8  
Unread 06-09-2009, 12:46 PM
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Re: Load development in 80 + degrees

Happens to me all the time. When I work up a load I usually try and find one that is below max but still gives good velocity. This allows some stability. I also find that the humidity affects the MV a great deal. By great deal I mean up to 100fps. That may be something as well.

My 168 Berger load is 70g of Retumbo. When it gets warm out I start to see plunger marks on the headstamp. WHen it is cool i'm good to go.
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  •   #9  
    Unread 06-09-2009, 11:34 PM
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    Re: Load development in 80 + degrees

    I have found that if you run a MAX load that was developed in cool air and 80+ degrees comes around, pressure signs are sure to follow. It doesnt matter if it is "extreme" powder or not.

    The difference is when using extreme powders and you work up to max and actually back off, things typically stay cool even in warmer air. They key is IF you back down from max. Other powders may be more sensitive and show signs of high pressure in warmer air than when developed even under max loads.

    The bottom line is that if youre running absolute max loads that were developed in cool air, be prepared for pressure signs in the heat regardless of what powder youre using.
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    Unread 06-10-2009, 07:13 AM
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    Re: Load development in 80 + degrees

    Quote:
    Originally Posted by Michael Eichele View Post
    I have found that if you run a MAX load that was developed in cool air and 80+ degrees comes around, pressure signs are sure to follow. It doesnt matter if it is "extreme" powder or not.

    The difference is when using extreme powders and you work up to max and actually back off, things typically stay cool even in warmer air. They key is IF you back down from max. Other powders may be more sensitive and show signs of high pressure in warmer air than when developed even under max loads.

    The bottom line is that if youre running absolute max loads that were developed in cool air, be prepared for pressure signs in the heat regardless of what powder youre using.
    I understand and expected that. I also understand no powder is impervious to temp. I just listed the powder type cause if I didn't someone would have asked. what surprised me is not being able to get within 100 fps or a grain of powder of "listed" max when working up in the hot weather. I have never been able to produce super fast loads in this gun (it just won't tolerate it) but have always been able to get a little closer than this.
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      #11  
    Unread 06-10-2009, 07:44 AM
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    Re: Load development in 80 + degrees

    Your rifle may like a different powder for the 130's than the 140's. Why not back off your load for the 140's a grain or two for the summer shooting, and when hunting season comes around go back to your cool weather load?

    Just a thought,

    Steve
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