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Rifles, Reloading, Optics, Equipment
Reloading
Stable Powder
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<blockquote data-quote="goodgrouper" data-source="post: 89879" data-attributes="member: 2852"><p>Internal pressures rise from both the steel being warmer and the powder/brass/primer being warmer. Remember what happens to ammo left in a ammo box in the sun? Why does it shoot faster and have more pressure?</p><p></p><p>The same thing happens to ammo that is heated up in a chamber. In full automatic rifles under sustained fire, a round can actually cook off (fire without the trigger being pulled) from internal chamber heat.</p><p></p><p>So basicly, it doesn't matter how the round got heated, it will have the same effect on pressure and there ain't a dang thing the powder can do about it. /ubbthreads/images/graemlins/frown.gif</p><p></p><p></p><p>My 300 winnie likes RL-22 also and there is 100-175 fps difference between my summer load and my winter load depending on the lot! Crazy. That is why I never load huge quantities of ammo at one time unless I am positive what time of the year I'm going to be shooting them in.</p><p></p><p>Generally, I will go one grain low and one grain high of the normal load and chrono the stuff a few days before the hunt or shooting session just to stay on top of things. Pain in the rear I know but that is what you have to do to stay on the cutting edge of performance.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 89879, member: 2852"] Internal pressures rise from both the steel being warmer and the powder/brass/primer being warmer. Remember what happens to ammo left in a ammo box in the sun? Why does it shoot faster and have more pressure? The same thing happens to ammo that is heated up in a chamber. In full automatic rifles under sustained fire, a round can actually cook off (fire without the trigger being pulled) from internal chamber heat. So basicly, it doesn't matter how the round got heated, it will have the same effect on pressure and there ain't a dang thing the powder can do about it. [img]/ubbthreads/images/graemlins/frown.gif[/img] My 300 winnie likes RL-22 also and there is 100-175 fps difference between my summer load and my winter load depending on the lot! Crazy. That is why I never load huge quantities of ammo at one time unless I am positive what time of the year I'm going to be shooting them in. Generally, I will go one grain low and one grain high of the normal load and chrono the stuff a few days before the hunt or shooting session just to stay on top of things. Pain in the rear I know but that is what you have to do to stay on the cutting edge of performance. [/QUOTE]
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