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The stabilizers in modern powders do deteriorate when subjected to heat.

But it takes at least 1,5-4 year (depending on the concentrate of NG) in 65 degree celcius to get it to a point where it start to effect the powder.

So its possible, but it will be a wery long and sweaty hunt.

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450_366?

What about powders without nitroglycerin, ie: the single base stick powders made from nitrocellulose only? The double base powders are made from nitrocellulose plus nitroglycerine in varying amounts, I believe.

None of the ball or spherical powders sold by Hodgon are listed as being "Extreme". My own findings are that in -20C temps, rounds from 7X57 through '06 and .375's, when using ball or spherical powders, you can expect up to 150fps reduction is speed from a load developed in 70F temps. Then again, using ball powder, I noticed a drop of a good 175fps in my .218Bee Ruger #1 when tested at -20C (about -5F). Perhaps ctg. size does not matter as much as ctg. used. In 80F temps, it was an absolute max. load.

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SB powders would land at about 2,5-3 years time, but thats aging of the powder.

I don think its if its a SB or DB powder thats the problem. A SB powder is less vulnerable to lower temeratures than the DB powders, a DB can actually produce higher pressures in extreme low temperature.

But all are affected by heat as the flame travels faster in higher temperatures. But if i remember right then about 1m/s and 1MPa to every degree celcius is a normal diffence.

So if you developed the load with -20c components and carried it in a pocket that say was 40c, it would add around 60ms and 60Mpa on the load.

Nevertheless, i dont think the pockets are hotter then the blued barrels if its used in hot climate anyway.

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Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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