Read an interesting article on temp and pressure

[DaveInOroValley]

Especially with summer upon us I normally never thought of any consideration of ambient temprature and change in pressure of various loads but it is something to consider if your loading at the maximum pressure on hot loads.

Dupont had an article that mentioned this under certain conditions you could have too hot of a load if the ambient temprature raises it can effect different powders significantly.

Probably not something any of us have to be too concerned about but it was interesting.

[Na-vah-duh]

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[CALI SHOT DOC]

I was reading in american rifleman today that when snipers need to get more distance out of their rounds, they would "cook" them out in the sun which would increase pressure therefore increasing velocity.

[DaveInOroValley]

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It was in an issue of "Shooting" magazine I happened to read while waiting at the MD, sorry I don't remember the month but it was pretty recent.

[XDRoX]

Also good to know that some powders are much more temperature sensitive than others.

A general rule of thumb is that extruded powders are less sensitive to temp than ball, flake, or even smaller grained extruded.

Hunters have to be most concerned with temp sensitive powders. Hunting in 90 degree weather or 10 degree weather could really change the characteristics of a round. For target and plinking most of us don't have to worry about it.

There are powders that are known for being temp sensitive like RE19 and RE22 that can lose several hundred fps in very low temps.

Most modern powders are not temp sensitive.