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Rifles, Reloading, Optics, Equipment
Reloading
Cold temp caused faster speeds
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<blockquote data-quote="AudentesFortunaJuvat" data-source="post: 2063434" data-attributes="member: 115510"><p>Figured I'd tag on a year later-</p><p></p><p>I've been shooting my 6.5 CM starting the shooting season back in march of 2020. I was shooting anywhere from 40F(march) to 90F(august) and found my velocity with RL16 was going between about 2710-2740 so about 30FPS through roughly a 50 degree temperature fluctuation, all at the same shooting location.</p><p></p><p>This past weekend it was about 30F, and my velocity had increased to about 2760, peaking at 2767. I've always understood that pressure would gain with temperature gain so I'm quite thrown by getting pressure signs with my go to load that was solid at 40F-90F, now giving lightly sticky bolt and some fresh ejector marks at 30F. </p><p></p><p>Specs:</p><p>Christensen Action</p><p>Proof Carbon 1:8 22" Barrel</p><p>6.5 Creedmoor</p><p>16x Fired Petersen Brass, sized, charged and seated as usual with 42.2g RL16.</p><p>Berger 140VLD Hunting</p><p>CCI#450 SRP</p><p></p><p>No visual signs of concern with the brass, same bullet lot I've been using, same RL16 8lb jug I've used all year, same reloading process, trim length, neck tension, etc. Overall, I haven't changed a thing that I can tell, apart from the brass being on its 16th firing. Loads were stored in 60F garage, transported to shooting location in 70F truck, outside in 30F air for about an hour before first firing.</p><p></p><p>Thoughts?</p></blockquote><p></p>
[QUOTE="AudentesFortunaJuvat, post: 2063434, member: 115510"] Figured I'd tag on a year later- I've been shooting my 6.5 CM starting the shooting season back in march of 2020. I was shooting anywhere from 40F(march) to 90F(august) and found my velocity with RL16 was going between about 2710-2740 so about 30FPS through roughly a 50 degree temperature fluctuation, all at the same shooting location. This past weekend it was about 30F, and my velocity had increased to about 2760, peaking at 2767. I've always understood that pressure would gain with temperature gain so I'm quite thrown by getting pressure signs with my go to load that was solid at 40F-90F, now giving lightly sticky bolt and some fresh ejector marks at 30F. Specs: Christensen Action Proof Carbon 1:8 22" Barrel 6.5 Creedmoor 16x Fired Petersen Brass, sized, charged and seated as usual with 42.2g RL16. Berger 140VLD Hunting CCI#450 SRP No visual signs of concern with the brass, same bullet lot I've been using, same RL16 8lb jug I've used all year, same reloading process, trim length, neck tension, etc. Overall, I haven't changed a thing that I can tell, apart from the brass being on its 16th firing. Loads were stored in 60F garage, transported to shooting location in 70F truck, outside in 30F air for about an hour before first firing. Thoughts? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Cold temp caused faster speeds
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