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Newer powders are not as temp sensitive as the older ones, but yes, we tell the snipers to maintain the same temp or shifts will occur. The easiest is to keep your rounds next to you for zeroing and again before a shot. Not let the ammo heat up in the chamber of a hot weapon, in the sun, or conversely setting out in freezing weather.
It is the little things that will bite you on the long shots. You will get away with not protecting your ammo in the short ranges but at longer ranges you will pay for it. The greater the range the greater the effect. Most shooters know to to let their ammo set out int eh sun but forget about the cold which has the reverse effect.
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Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard. 
Experience is what you get right after you need it.
Author unknown. 
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