Temp sensitivity of powders

The Oregonian

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Jul 20, 2012
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Nashville, Tennessee
It is hot as hell in Tennessee in the summer...can I get a good idea of how this load will vary in velocity in colder weather by putting loaded rounds in freezer prior to shooting? Will that give me a good idea, some idea, or no idea (bc maybe the rifle steel has to be cold as well, or some other reason)?

Obviously will test as the weather cools down but hoping to get an idea at this point.
 

bigedp51

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Dec 10, 2010
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The number below to the right of the type powder is the fps change for each degree of temp change.
The single base Hodgdon's Extreme Powders are the least sensitive to temp change.
Example of double and single base powders, the military switched from RL15 to IMR-4064 in their 7.62 long range sniper ammunition. This was due to the temp extremes in Iraq and Afghanistan.

Click on the image below to enlarge.

 

ShtrRdy

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Jan 14, 2012
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2,851
Location
High Plains
It will give you some information. A friggin cold barrel will be slightly smaller diameter so that will increase pressure a bit.
 

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