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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Caution in the cold
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<blockquote data-quote="284saum" data-source="post: 1574344" data-attributes="member: 96333"><p>Last weekend I tested the cold gun/warm gun difference. Day 1, cold rifles (-2F), Day 2, warm rifles (72F). Ammo was cold (-2F) in both days testing</p><p></p><p>Ammo left outside overnight in temps of -25C (-13F) . Was exactly -19C (-2F) when I shot, same as day before with cold gun/cold ammo.. Rifles were left inside all night, loaded into warm truck (heater set to 22C / 72F) and left inside the idling truck until ready to shoot.</p><p></p><p>Ruger Scout 223, 55gr Hornady SP / IMR 4198</p><p>Cold gun - 2871 fps</p><p>Warm gun - 2881 fps</p><p></p><p>Tikka T3x CTR 6.5 Creed</p><p>130gr Sierra TGK / RL17</p><p>Cold gun - 2817 fps</p><p>Warm gun - 2819 fps</p><p></p><p>147gr ELDm / RL26</p><p>cold gun - 2533 fps</p><p>warm gun - 2561 fps</p><p></p><p>Tikka 6.5 PRC</p><p>140gr Nosler Accubond / RL26</p><p>cold gun - 3075 fps</p><p>Warm gun - 3071 fps</p><p></p><p>143gr Hornady ELDx / RL26</p><p>cold gun - 2925 fps</p><p>warm gun - 2909 fps</p><p></p><p>Defiance 280 Ackley</p><p>160gr Nosler Accubond / RL26</p><p>cold gun - 3001 fps</p><p>warm gun - 3010 fps</p><p></p><p>165gr Sierra TGK / Accurate MagPro</p><p>cold gun - 2800 fps</p><p>warm gun - 2814 fps</p><p></p><p>195gr Berger EOL / RL26</p><p>cold gun 2677 fps</p><p>warm gun 2671 fps</p><p></p><p>Ruger m77 Scout 308 Win, 208gr ELD / Varget</p><p>cold gun - 2215 fps</p><p>warm gun - 2241 fps</p><p></p><p>Ruger no1 300wm 175gr LRX / RL26</p><p>cold gun - 3067 fps</p><p>warm gun - 3063 fps</p><p></p><p>Defiance 338-06</p><p>230gr ELDx / Ramshot BigGame</p><p>cold gun - 2489 fps</p><p>Warm gun - 2515 fps</p><p></p><p>250gr Woodleigh PP / Ramshot BigGame</p><p>cold gun - 2389 fps</p><p>warm gun - 2399 fps</p><p></p><p>Ruger m77 375 Ruger</p><p>270gr LRX / Ramshot BigGame</p><p>cold gun - 2578 fps</p><p>warm gun - 2579 fps</p><p></p><p>300gr Nosler Parition / Win760</p><p>cold gun - 2550 fps</p><p>warm gun - 2556 fps</p><p></p><p></p><p>Average speed of cold rifle = 2713 fps</p><p>Average speed of warm rifle = 2720 fps</p><p>.003% change. I think it's safe to say the temperate of the rifle plays a very minimal role in velocity of the ammunition.</p><p></p><p>Measured with Labradar doppler</p></blockquote><p></p>
[QUOTE="284saum, post: 1574344, member: 96333"] Last weekend I tested the cold gun/warm gun difference. Day 1, cold rifles (-2F), Day 2, warm rifles (72F). Ammo was cold (-2F) in both days testing Ammo left outside overnight in temps of -25C (-13F) . Was exactly -19C (-2F) when I shot, same as day before with cold gun/cold ammo.. Rifles were left inside all night, loaded into warm truck (heater set to 22C / 72F) and left inside the idling truck until ready to shoot. Ruger Scout 223, 55gr Hornady SP / IMR 4198 Cold gun - 2871 fps Warm gun - 2881 fps Tikka T3x CTR 6.5 Creed 130gr Sierra TGK / RL17 Cold gun - 2817 fps Warm gun - 2819 fps 147gr ELDm / RL26 cold gun - 2533 fps warm gun - 2561 fps Tikka 6.5 PRC 140gr Nosler Accubond / RL26 cold gun - 3075 fps Warm gun - 3071 fps 143gr Hornady ELDx / RL26 cold gun - 2925 fps warm gun - 2909 fps Defiance 280 Ackley 160gr Nosler Accubond / RL26 cold gun - 3001 fps warm gun - 3010 fps 165gr Sierra TGK / Accurate MagPro cold gun - 2800 fps warm gun - 2814 fps 195gr Berger EOL / RL26 cold gun 2677 fps warm gun 2671 fps Ruger m77 Scout 308 Win, 208gr ELD / Varget cold gun - 2215 fps warm gun - 2241 fps Ruger no1 300wm 175gr LRX / RL26 cold gun - 3067 fps warm gun - 3063 fps Defiance 338-06 230gr ELDx / Ramshot BigGame cold gun - 2489 fps Warm gun - 2515 fps 250gr Woodleigh PP / Ramshot BigGame cold gun - 2389 fps warm gun - 2399 fps Ruger m77 375 Ruger 270gr LRX / Ramshot BigGame cold gun - 2578 fps warm gun - 2579 fps 300gr Nosler Parition / Win760 cold gun - 2550 fps warm gun - 2556 fps Average speed of cold rifle = 2713 fps Average speed of warm rifle = 2720 fps .003% change. I think it's safe to say the temperate of the rifle plays a very minimal role in velocity of the ammunition. Measured with Labradar doppler [/QUOTE]
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