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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Temperature vs velocity - gun powder
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<blockquote data-quote="284saum" data-source="post: 1572856" data-attributes="member: 96333"><p>Interesting data below. Ignition consistency suffers in the cold on average. But that doesn't explain to me, the increase in velocity. Just shows a sloppiness of velocity</p><p></p><p>223, Dominion small rifle primer (Russian manuf.)</p><p>Standard deviation of 27 fps at +7c, and SD of 36 @ -19c</p><p></p><p>6.5cm, CCI 450 small rifle magnum primer (Lapua brass 147gr ELD load)</p><p>SD of 11 fps at -2c, SD 26 fps at -19c</p><p></p><p>6.5cm, Fed210M large rifle (Alpha brass 130gr TGK load)</p><p>SD of 4 fps at +5c, SD of 9 at -19c</p><p></p><p>6.5 PRC, Fed 210M large rifle</p><p>SD of 11 fps at +13c, SD of 25 at -19c (140gr AB RL26)</p><p>SD of 9 fps at +10c, SD of 17 at -19c (143 ELDx RL26)</p><p></p><p>280 Ackley, Fed 210M large rifle</p><p>SD of 9 fps at +6c, SD of 14 at -19c (160 AB RL26)</p><p>SD of 22 fps at -2c, SD of 25 fps at -19c (165 TGK Magpro)</p><p>SD of 8 fps at +10c, SD of 28 fps at -19c (195 EOL RL26)</p><p></p><p>308 Win, Fed 210M large rifle</p><p>SD of 21 fps at +12c, SD of 46 fps at -19c</p><p></p><p>300wm, Winchester Large rifle magnum primer</p><p>SD of 11 fps at +18c, SD of 12 fps at -19c</p><p></p><p>338-06, Fed 210M large rifle</p><p>SD of 10 fps at +10c, SD of 6 fps at -19c (230 ELDx BigGame)</p><p>SD of 8 fps at +17c, SD of 22 fps at -19c</p><p></p><p>375 Ruger, Fed 210 large rifle magnum primer</p><p>SD of 7 fps at +10c, SD of 11 fps at -19c (270LRX BigGame)</p><p>SD of 16 fps at +23c, SD of 12 fps at -19c (300NP W760)</p><p></p><p>On average, SD in warmer temp (+9c avg) was 12 fps. In cold (-19c), 21 fps. That's 75% more velocity variation when temps dropped 32 degrees Celsius</p></blockquote><p></p>
[QUOTE="284saum, post: 1572856, member: 96333"] Interesting data below. Ignition consistency suffers in the cold on average. But that doesn't explain to me, the increase in velocity. Just shows a sloppiness of velocity 223, Dominion small rifle primer (Russian manuf.) Standard deviation of 27 fps at +7c, and SD of 36 @ -19c 6.5cm, CCI 450 small rifle magnum primer (Lapua brass 147gr ELD load) SD of 11 fps at -2c, SD 26 fps at -19c 6.5cm, Fed210M large rifle (Alpha brass 130gr TGK load) SD of 4 fps at +5c, SD of 9 at -19c 6.5 PRC, Fed 210M large rifle SD of 11 fps at +13c, SD of 25 at -19c (140gr AB RL26) SD of 9 fps at +10c, SD of 17 at -19c (143 ELDx RL26) 280 Ackley, Fed 210M large rifle SD of 9 fps at +6c, SD of 14 at -19c (160 AB RL26) SD of 22 fps at -2c, SD of 25 fps at -19c (165 TGK Magpro) SD of 8 fps at +10c, SD of 28 fps at -19c (195 EOL RL26) 308 Win, Fed 210M large rifle SD of 21 fps at +12c, SD of 46 fps at -19c 300wm, Winchester Large rifle magnum primer SD of 11 fps at +18c, SD of 12 fps at -19c 338-06, Fed 210M large rifle SD of 10 fps at +10c, SD of 6 fps at -19c (230 ELDx BigGame) SD of 8 fps at +17c, SD of 22 fps at -19c 375 Ruger, Fed 210 large rifle magnum primer SD of 7 fps at +10c, SD of 11 fps at -19c (270LRX BigGame) SD of 16 fps at +23c, SD of 12 fps at -19c (300NP W760) On average, SD in warmer temp (+9c avg) was 12 fps. In cold (-19c), 21 fps. That's 75% more velocity variation when temps dropped 32 degrees Celsius [/QUOTE]
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