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Old October 11, 2012, 11:10 PM   #2
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Join Date: March 16, 2010
Posts: 733
It shouldn't affect accuracy much, but depending on your powder, it can significantly affect POI (Point Of Impact). You might have a .5" group perfectly centered on the bulls at 85f, and then you shoot at 35f, your .5" group will be low....

The reason is velocity. Many powders will have major velocity differences at different temperatures, high temps will cause velocity to go up, while lower temps will be opposite....

If possible, zero your rifle as close to the temp you plan to shoot as possible....

Also, some powders are much less temp sensitive than others. Hodgdon "extreme" powders at made to have very little velocity change with temp swings... I use Varget, which is an extreme powder, and develop my loads in the summer, then when I do my final sight in just before the hunt, I have not noticed any significant accuracy or POI change.
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