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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cold weather Chronograph results.
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<blockquote data-quote="Cold Trigger Finger" data-source="post: 735532" data-attributes="member: 56732"><p>Well I just did some more speed testing. </p><p> 6.5 Creedmoor, Ruger m77 MKII Hawkeye Stainless 26" factory barrel.</p><p>temp. 40 below F. </p><p>Hornady Superformance 129 gr SST</p><p> Rifle an ammo were outside for 2 hours before speed test. Ammo was stood upright and seperated from each other.</p><p>1, 2893</p><p>2, 2933</p><p>3, 2932. Feet per second</p><p></p><p>The vel listed on the box is 2960 f.p.s.</p><p> It felt when chambering each round prior to firing that the chamber was tighter or the ammo was fatter. Doesn't steel contract when it gets cold. Anyway the brass was tougher to extract. But it did extract. There was a dark colored ring around the brass about midway up the case. Also a buffed ring around the brass . The primere are a little flatter than when this ammo is fired in this rifle at +60°F. But they were fine. </p><p>There is a gas ring around the necks approximately 1/8 " down the necks.</p></blockquote><p></p>
[QUOTE="Cold Trigger Finger, post: 735532, member: 56732"] Well I just did some more speed testing. 6.5 Creedmoor, Ruger m77 MKII Hawkeye Stainless 26" factory barrel. temp. 40 below F. Hornady Superformance 129 gr SST Rifle an ammo were outside for 2 hours before speed test. Ammo was stood upright and seperated from each other. 1, 2893 2, 2933 3, 2932. Feet per second The vel listed on the box is 2960 f.p.s. It felt when chambering each round prior to firing that the chamber was tighter or the ammo was fatter. Doesn't steel contract when it gets cold. Anyway the brass was tougher to extract. But it did extract. There was a dark colored ring around the brass about midway up the case. Also a buffed ring around the brass . The primere are a little flatter than when this ammo is fired in this rifle at +60°F. But they were fine. There is a gas ring around the necks approximately 1/8 " down the necks. [/QUOTE]
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Cold weather Chronograph results.
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