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Rifles, Reloading, Optics, Equipment
Reloading
Temp related velocity loss
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<blockquote data-quote="sewwhat89" data-source="post: 90402" data-attributes="member: 4587"><p>[ QUOTE ]</p><p>In limited experiments,RL-22 drops 2 fps per degree of temperature.</p><p>Jimmy </p><p></p><p>[/ QUOTE ]</p><p></p><p>IMO, yes and no. In the rifles I've chrono'd with RL22, I get consistent velocities in the 70-90 degree range. When its 105, the velocities do go up, way up, along with the pressure. I will chrono my 190 VLDs in January when its chilly to see how much I lose.</p><p></p><p>Out of curiosity, I wonder what effect load density has on the velocity difference. With three different seating depths I tested in late August early September, the bullet 0.005" into the lands was the fastest and most accurate, a bullet loaded 0.005" off the lands was the slowest and a bullet loaded roughly 0.050" off the lands to fit in the mag was just under the bullet into the lands. I don't care to get into the physics of how and whys, but I am getting the same results in my 300 RSAUM with SMKs and heavier Berger VLDs. I am shooting 175 SMKs at 2875 fps with the bullet off the lands and 185 gr Berger VLDs about 0.010" into the lands at up to 2971 before I got crater'd primers and sticky extractions. Everything else was the same. I don't plan to do anymore experiements like that changing components and all, but I may have found a greener pasture. Time and more groups will tell.</p></blockquote><p></p>
[QUOTE="sewwhat89, post: 90402, member: 4587"] [ QUOTE ] In limited experiments,RL-22 drops 2 fps per degree of temperature. Jimmy [/ QUOTE ] IMO, yes and no. In the rifles I've chrono'd with RL22, I get consistent velocities in the 70-90 degree range. When its 105, the velocities do go up, way up, along with the pressure. I will chrono my 190 VLDs in January when its chilly to see how much I lose. Out of curiosity, I wonder what effect load density has on the velocity difference. With three different seating depths I tested in late August early September, the bullet 0.005" into the lands was the fastest and most accurate, a bullet loaded 0.005" off the lands was the slowest and a bullet loaded roughly 0.050" off the lands to fit in the mag was just under the bullet into the lands. I don't care to get into the physics of how and whys, but I am getting the same results in my 300 RSAUM with SMKs and heavier Berger VLDs. I am shooting 175 SMKs at 2875 fps with the bullet off the lands and 185 gr Berger VLDs about 0.010" into the lands at up to 2971 before I got crater'd primers and sticky extractions. Everything else was the same. I don't plan to do anymore experiements like that changing components and all, but I may have found a greener pasture. Time and more groups will tell. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Temp related velocity loss
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