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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Temp sensitive powder and fps ?
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<blockquote data-quote="Kennibear" data-source="post: 889051" data-attributes="member: 51650"><p>Re read you original post. Your chrono not reading is a problem. But you need to check the actual speed at 7F degrees. Hard to believe it is -200fps.</p><p></p><p>Sometimes shooting MUCH closer to the screens helps. My 45's read every shot. The 556 needs to be no more than 6" above the slits and dead center. I built armored sleds for my chronographs so I don't hammer them when I do this.</p><p></p><p>Huge density altitude change between your two range sessions. The cold one may have been at or below sea level DA. 55F @ 4500' altitude may be close to standard conditions. Dial in the changes in conditions and see how close it conforms.</p><p></p><p>Finding solutions to this sort of thing is the both frustrating and fascinating thing about this hobby. Kind of like women.....</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 889051, member: 51650"] Re read you original post. Your chrono not reading is a problem. But you need to check the actual speed at 7F degrees. Hard to believe it is -200fps. Sometimes shooting MUCH closer to the screens helps. My 45's read every shot. The 556 needs to be no more than 6" above the slits and dead center. I built armored sleds for my chronographs so I don't hammer them when I do this. Huge density altitude change between your two range sessions. The cold one may have been at or below sea level DA. 55F @ 4500' altitude may be close to standard conditions. Dial in the changes in conditions and see how close it conforms. Finding solutions to this sort of thing is the both frustrating and fascinating thing about this hobby. Kind of like women..... KB [/QUOTE]
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Temp sensitive powder and fps ?
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