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Is IMR Powder more heat sensitive?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 12:02
garyalarson View Drop Down
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Talked to a fellow shooter at the range this weekend, and he mentioned that IMR Powder tends to be more sensitive to heat than other powders. It's been pretty warm here in NC lately, and he found IMR to fluxuate alot based on how hot/cold it was outside.
 
Thoughts/experiences?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 12:04
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Superstool

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Varget is great for shooting in multiple temps.  It is very stable
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 12:30
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Chief Sackscratch

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I have found varget is the most stable for me in all conditions.  Never messed much with IMR but do have some for some unique rounds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 13:15
Roy Finn View Drop Down
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From what I've read from John Barsness, Hodgdon Extreme powders are the least effected by temp changes.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 13:42
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Whatever goes into Hornady TAP is very, very temp sensitive!

I shoot allot in South Texas and cannot say I have seen significant fluctuations in IMR4831 or IMR7828, both of which have been used in 100 degree down to 15 degree conditions - and functioned as they should.

Keep in mind that point of impact changes with temperature too, so temp sensitivity is more complicated than just powder sensitivity.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 16:16
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I'm one of those who believes, based on what I've seen and used, that lot to lot variations of the same powder have more to do with performance than how, supposedly,  temperature sensitive powders are.  I've come to this conclusion hunting in the Texas Panhandle down to 10* and shooting here in W TX in the 90's.  I do believe Barsness is correct though about the Hodgdon Extremes.   
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2013 at 22:14
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The 500 series Vihtavouri powders are also very temperature stable based on extensive shooting in Idaho, Wyoming and Las Vegas throughout the year over about a 15 year period.  Pricing is above US powders and locating it is not always easy.  If you varmint hunt in hot weather try putting your ammo in a cooler with a small piece of dry ice or a re-freezable ice pack.  As previously noted Varget is stable and a good all around starting point for many calibers.  Overall my most consistent accuracy loads across a wide range of calibers have been with various Vihtavouri and Reloader powders, also quite temperature stable in my experience.     

   

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