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IMR 4895 Temperature Sensitivity .270 win

Discussion in 'Handloading and Reloading' started by v8stang289, Feb 6, 2013.

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  1. v8stang289

    v8stang289 Member

    Oct 1, 2006
    Eastern NC
    I have a pound of IMR 4895 and was thinking about using it to work up a hunting load for my .270 win.

    I've heard that IMR 4895 is temperature sensitive in regards to pressures/velocity. Hodgdon shows a 166 fps spread between 0-125 degrees in a 22-250.

    I'm more interested in how it would be in a .270 in temperatures from 30-95 degrees.

    Most likely I would work up the load during the summer where it could be in the upper 80's to upper 90's, and then when Deer season rolls around temps are usually 30's-70's.

    So, any idea whether a load that shoots accurately and is sighted in at 95 degrees will still be ok at 30 degrees?

    Anybody have personal experience using IMR 4895 in these temps?

    I know there is no substitute for hands on experience, but I'm trying to find out now whether I need to find another powder or whether this is suitable.

  2. rcmodel

    rcmodel Member in memoriam

    Sep 17, 2007
    Eastern KS
    Load it, Shoot it.

    Temperature sensitive is another recent innovative catch-word to sell new powders previously unavailable.

    IMR stood for Improved Military Rifle powder when it was invented, concocted, mixed, or whatever is is they do when a new powder coating is formulated.

    IMR-4895 fought WWII & Korea in Jungle heat and Arctic cold just fine.

    Unless you work up a primer blowing, bolt sticking, too-hot load in August?

    The deer you kill with it in November won't notice any difference a tall.

  3. Jim Watson

    Jim Watson Member

    Dec 24, 2002
    The only question I might have is not temperature but suitability.
    You will not get top velocity with 4895 in a .270. It would be more at home with 4350 or 4831.
    But you might get top accuracy. If that is the powder you have, go shooting.
  4. plodder

    plodder Member

    Jan 1, 2011
    Deep in a bunker behind the cheddar curtain
    I use 4895 as my "one size fits all" powder in 5.56/.223, 25-06, .270 and 30-06 including Garand loads and in temp extremes exceeding both ends of your 30-95 range reference and I am confident that powder sensitivity to temperature has never been the weak link in the trigger pull to target impact sequence of events.
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