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Rifles, Reloading, Optics, Equipment
Reloading
Cold weather velocity
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<blockquote data-quote="rooster721" data-source="post: 729961" data-attributes="member: 40654"><p>Greyfox is right. </p><p> </p><p>I'm up in Alberta, Canada and shoot in temps ranging from say -15F to also high 80's during summer months.. in fact just this past saturday was out doing some shooting, about -5F (-20C) using the Hodgdon powders.. my Muzzle velocity changes literally nothing, but the rate in which the air-density slows the bullet downrange becomes pretty obvious. Those that say one click (+/-) per 20 degrees, they're pretty close. I find a click, click n a half difference per 20 with my rifles... seems very true</p><p> </p><p>We shot to 820 this last weekend.. 440, 650 and 820 were where I set the gongs. The trajectories in one rifle using H-1000 and one using retumbo both were consistent with the 1 click per 20 statement, charts were adjusted only for temp.. no muzzle velocity adjustment what-so-ever. Good stable powder is a must**</p><p> </p><p>All that said.. I like IMR 7828 actually, as a next best to the Extreme line from Hodgdon... BUT have clocked ~100fps swings using that 7828. Good podwer, but not for long-distances where cold/hot drastic swings take place... fwiw</p></blockquote><p></p>
[QUOTE="rooster721, post: 729961, member: 40654"] Greyfox is right. I'm up in Alberta, Canada and shoot in temps ranging from say -15F to also high 80's during summer months.. in fact just this past saturday was out doing some shooting, about -5F (-20C) using the Hodgdon powders.. my Muzzle velocity changes literally nothing, but the rate in which the air-density slows the bullet downrange becomes pretty obvious. Those that say one click (+/-) per 20 degrees, they're pretty close. I find a click, click n a half difference per 20 with my rifles... seems very true We shot to 820 this last weekend.. 440, 650 and 820 were where I set the gongs. The trajectories in one rifle using H-1000 and one using retumbo both were consistent with the 1 click per 20 statement, charts were adjusted only for temp.. no muzzle velocity adjustment what-so-ever. Good stable powder is a must** All that said.. I like IMR 7828 actually, as a next best to the Extreme line from Hodgdon... BUT have clocked ~100fps swings using that 7828. Good podwer, but not for long-distances where cold/hot drastic swings take place... fwiw [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Cold weather velocity
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