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Powder Temp.
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<blockquote data-quote="FlGunner" data-source="post: 1469276" data-attributes="member: 94240"><p>I've seen the guys on Gunwerks do an example on youtube shooting ammo that had been left in a cooler versus ammo that was as same as the outside temp. I believe they were using Retumbo in a 7mm Remington mag but I might be wrong on the caliber. Anyways there was some difference but nothing drastic. I believe all powder is sensitive to some degree and that a particular powder may be better suited to a specific bullet in your particular gun to where it isn't effected as say a different powder. I shoot H1000 in one 7mm Remington Mag and Retumbo in another. Both have low ES/SD. My sendero loved H1000 and the SPS loves Retumbo. Neither do as good with the other powder. I too tried freezing a few rounds and shooting them and didn't see much difference from ammo at ambient temps. I think air density, humidity, and elevation all play a part in the relationship to velocity and temp stability as well. Hopefully some of the more experienced guys will chime in. I hope I ain't completely wrong lol, just what I've seen with my shooting here in FL. I can say that load work up I done in the summer with high humidity had no real change in December and January when we see lows in the 30's and low humidity.</p></blockquote><p></p>
[QUOTE="FlGunner, post: 1469276, member: 94240"] I've seen the guys on Gunwerks do an example on youtube shooting ammo that had been left in a cooler versus ammo that was as same as the outside temp. I believe they were using Retumbo in a 7mm Remington mag but I might be wrong on the caliber. Anyways there was some difference but nothing drastic. I believe all powder is sensitive to some degree and that a particular powder may be better suited to a specific bullet in your particular gun to where it isn't effected as say a different powder. I shoot H1000 in one 7mm Remington Mag and Retumbo in another. Both have low ES/SD. My sendero loved H1000 and the SPS loves Retumbo. Neither do as good with the other powder. I too tried freezing a few rounds and shooting them and didn't see much difference from ammo at ambient temps. I think air density, humidity, and elevation all play a part in the relationship to velocity and temp stability as well. Hopefully some of the more experienced guys will chime in. I hope I ain't completely wrong lol, just what I've seen with my shooting here in FL. I can say that load work up I done in the summer with high humidity had no real change in December and January when we see lows in the 30's and low humidity. [/QUOTE]
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