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Thread: Effects Of Outdoor Temperature On Reloaded Shotshells ?

  1. #1
    Marksman

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    Effects Of Outdoor Temperature On Reloaded Shotshells ?

    Have seen cautions on line about shooting reloaded shotshells in the hot summer that were reloaded in the winter. Say you reload in your garage at 60 F---and then shoot them outside when it's say 85. Is there really that much of a change in pressure? Exactly why? Always wondered about this and would appreciate a detailed answer. Obviously things expand when it's warmer but what happens to the powder etc?

  2. #2
    Marksman

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    I reload all year for Cowboy Action. Never heard of such a thing. It's not like the temp in your HOUSE changes that much. It's not 35 in your reloading room or 80+. WTH

  3. #3
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    VUPDblue's Avatar

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    I have reloaded thousands and thousands of shotshells during all times of the year and never experienced any adverse or notable effects of season or temperature.
    VUPDblue's Rule #1: Don't be a jerk.

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  4. #4
    Grandmaster Cameramonkey's Avatar

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    Not quite. Its load testing and working up a load that is the issue.

    When you try to work up a load and chrono it in the cold, it will perform much "hotter" (no pun) during the summer.

    So its not when you load that matters. Its when you test an unknown load to determine max velocity that matters.

    The takeaway: When you are testing a new load, do the testing outside during the heat of summer, not outside in the cold. Once you have a good load, reload to that spec any time you please.
    Last edited by Cameramonkey; 01-15-2020 at 21:40.
    Quote Originally Posted by Kirk Freeman View Post
    A confused cop is an arresty cop.
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    also, where do we sign up to touch Frank's equipment?

  5. #5
    Master johntheplinker's Avatar

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    Quote Originally Posted by Cameramonkey View Post
    Not quite. Its load testing and working up a load that is the issue.

    When you try to work up a load and chrono it in the cold, it will perform much "hotter" (no pun) during the summer.

    So its not when you load that matters. Its when you test an unknown load to determine max velocity that matters.

    The takeaway: When you are testing a new load, do the testing outside during the heat of summer, not outside in the cold. Once you have a good load, reload to that spec any time you please.
    Nailed it.
    Tulta munille! HAKKAA PÄÄLLE

  6. #6
    Sharpshooter

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    I thought the spikes came when max loads are put in a hot barrel and sit there & bake for a couple minutes before being fired. When I shoot in Oklahoma in July, temps are 100+ degrees and barrels run 135.

  7. #7
    Grandmaster Cameramonkey's Avatar

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    Quote Originally Posted by Hawkeye7br View Post
    I thought the spikes came when max loads are put in a hot barrel and sit there & bake for a couple minutes before being fired. When I shoot in Oklahoma in July, temps are 100+ degrees and barrels run 135.
    That too. The hotter the powder is, the more power it produces when ignited. Whether its due to ambient temps or chamber temps it doesnt matter.

    The danger is when you develop a load in cold temps and its already a little "hot".


    (random numbers for art of discussion, I didnt actually run any calculations)
    So lets say you work up a load you want to be +P but you test the ladder load this time of year, and your outdoor range is at 25F. Lets say you end up with 4.6 gr under a 124gr 9MM and its only pushing 1200FPS. (book says max is 4.4gr)

    You load it up and go to a range in AZ 6 months later. Range temps are now nearly 100F. That round might now blow up a poorly engineered gun because now its got MUCH more energy and is trying to push that same bullet at 1600FPS and kablooey!
    Quote Originally Posted by Kirk Freeman View Post
    A confused cop is an arresty cop.
    Quote Originally Posted by hoosierdoc View Post
    also, where do we sign up to touch Frank's equipment?

  8. #8
    Sharpshooter openwell's Avatar

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    nonsense
    reloading for hunting & target loads using various reloading manuals
    staying within starting & max loads
    paying careful attension to listed components and OAL max
    careful examination of your brass.
    temp.@ time of shooting in a temperate climate like Indiana is a very small variable.
    although I do check to see the gun is sighted in with the ammo I intend to use; when I intend to use it.
    If I travel out-of-state I will check to see sights are still on. Cost of out-of-state license fees & travel cost & common sense will prevail.
    and better worry more about your clothing being correct for the local temps. that your reloads.
    LMAO
    No middle game, No end game; just Open the game well. French e4e6

  9. #9
    Sharpshooter openwell's Avatar

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    BTW
    I use reloaded ammo for almost all my firearms with the obvious exception of rimfire.
    and I shoot year-round outdoors
    and I reload year-round indoors
    I do cast bullets outdoors for safety sakes though

    No middle game, No end game; just Open the game well. French e4e6

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