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<blockquote data-quote="jimbires" data-source="post: 1427428" data-attributes="member: 11011"><p>temps in the upper 90's would concern me . I think about any powder is going to act differently when temps get this high, especially with high humidity .as a rule I don't shoot in these temps . </p><p> </p><p> I just don't see the wild temp swings the guys talk about . I'm sure powder behaves differently according to case fills . maybe by me using high fill % I kind of stabilize the powders , I don't know . in my first post I put up 90% as a minimum case fill . I'd reluctantly use 90% , I'd prefer 95 % - 105% case fill . case fill % much over 105 can cause problems too , one is pushing the bullets back out . I think a lot of temp testing could be flawed . I just don't believe you can take ammo out of a freezer and shoot it on a 90* day and get meaningful info . I'd rather put all the gear in the truck over night and go shoot the next morning . this way everything is at that temp , and the bullet is flying through air of the same temp . I recommend you work up a load and shoot it . shoot it when it's cold , and shoot it when it's hot . this is the only way you'll know how it acts for you .</p></blockquote><p></p>
[QUOTE="jimbires, post: 1427428, member: 11011"] temps in the upper 90's would concern me . I think about any powder is going to act differently when temps get this high, especially with high humidity .as a rule I don't shoot in these temps . I just don't see the wild temp swings the guys talk about . I'm sure powder behaves differently according to case fills . maybe by me using high fill % I kind of stabilize the powders , I don't know . in my first post I put up 90% as a minimum case fill . I'd reluctantly use 90% , I'd prefer 95 % - 105% case fill . case fill % much over 105 can cause problems too , one is pushing the bullets back out . I think a lot of temp testing could be flawed . I just don't believe you can take ammo out of a freezer and shoot it on a 90* day and get meaningful info . I'd rather put all the gear in the truck over night and go shoot the next morning . this way everything is at that temp , and the bullet is flying through air of the same temp . I recommend you work up a load and shoot it . shoot it when it's cold , and shoot it when it's hot . this is the only way you'll know how it acts for you . [/QUOTE]
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