Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Cold Powder

Discussion in 'Handloading and Reloading' started by Jayhawker, Dec 21, 2006.

Thread Status:
Not open for further replies.
  1. Jayhawker

    Jayhawker Member

    Joined:
    Jan 26, 2003
    Messages:
    233
    Location:
    Southwest Kansas
    Got a brand new .308 and a bunch of loads made-up with Varget, 4064,W748 and IMR 4895 to test 100 meter accuracy. I can handle the 35-40 degree weather but will the temperature affect the powder and invalidate my accuracy results once the weather warms up to a temperature that I do most of my shooting?
    Pete
     
  2. GRIZ22

    GRIZ22 Member

    Joined:
    Nov 4, 2006
    Messages:
    5,184
    I don't think so unless you are loading max loads for your gun (not the same as max loaded in the manual). I have worked up loads in cooler weather and checked them when it got warm and found no big difference. Maybe 50-60 fps in a 30-06 and no difference in accuracy.

    I have a 270 that shoots well but the barrel might be tighter than normal as high pressure signs start to show below what the manuals say is max. I worked up my loads for this rifle in hot weather and have no problem.
     
  3. USSR

    USSR Member

    Joined:
    Jul 7, 2005
    Messages:
    8,573
    Location:
    Finger Lakes Region of NY
    Significant change in temp will effect all powders, although the Varget to a much less degree than the others. Obviously, the effect will be a drop in velocity in cold weather, and a rise in velocity in hot weather. Whether or not the change in velocity effects the accuracy of the load is only something that can be determined thru testing.

    Don
     
  4. Pumpkinheaver

    Pumpkinheaver Member

    Joined:
    Jun 20, 2003
    Messages:
    1,255
    Location:
    missouri
    The hodgden "extreme" line of powders is supposed to less prone to velocity changes due to temp.
     
  5. 30Cal

    30Cal Member

    Joined:
    Feb 11, 2004
    Messages:
    2,299
    Location:
    Albany, NY
    W748 is the only one I'd worry about. Ball powders are far more sensitive than extruded.

    Ty
     
  6. mc223

    mc223 Member

    Joined:
    Jun 18, 2006
    Messages:
    860
    Location:
    Just Down the Road
    Last edited: Dec 22, 2006
  7. DWARREN123

    DWARREN123 Member

    Joined:
    May 1, 2006
    Messages:
    1,749
    Location:
    Between TN & KY
    I would worru that a max cool weather round would become over max in hot weather. Accuracy may or may not change, you just have to see.
     
Thread Status:
Not open for further replies.

Share This Page