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Rifles, Reloading, Optics, Equipment
Reloading
chrono speed, vs temperature
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<blockquote data-quote="D Scott" data-source="post: 555797" data-attributes="member: 35050"><p>Hi Im new to reloading, and would appreciate some feedback about some of my chrono'd speeds Im getting with my reloads.</p><p></p><p> I''m shooting a Savage LRP 260- remmington, I have been shooting Nosler 140 custom comp HPBT, with 45 g of H4831 sc, cci br2 primers, remm brass, doing load development shooting at 100 yards I have been keeping groups at or under a half inch, at 300 yards groups around 2.5 inches. my extreme spread has been about 14-15 fps, with the past 60 rounds., average MV at 2776 fps</p><p></p><p>Today I shot 3 groups of 15 (45) rounds with new remm brass with the same load as above with very different velocity results, the temp was about 10 degrees cooler, and the pressure approx the same from the last session</p><p></p><p>fist group 2865 mv, with ES of 41</p><p>2nd group 2801 mv ES 57</p><p>3rd group 2766 mv ES39</p><p>I have been meticulous with brass prep and weighting each load precisely on a beam scale assuming its not a faulty chrono (chrony master-beta) great name, it was very windy today though</p><p></p><p>can muzzle velocity shift as the ambient temperature of the cartridge shifts to a higher or lower temp? would that change the ES ? would you expect a shift of over 100 fps from a change of 20 degrees or less? </p><p></p><p>any input would be greatly appreciated . </p><p></p><p>thanks in advance Scott</p></blockquote><p></p>
[QUOTE="D Scott, post: 555797, member: 35050"] Hi Im new to reloading, and would appreciate some feedback about some of my chrono'd speeds Im getting with my reloads. I''m shooting a Savage LRP 260- remmington, I have been shooting Nosler 140 custom comp HPBT, with 45 g of H4831 sc, cci br2 primers, remm brass, doing load development shooting at 100 yards I have been keeping groups at or under a half inch, at 300 yards groups around 2.5 inches. my extreme spread has been about 14-15 fps, with the past 60 rounds., average MV at 2776 fps Today I shot 3 groups of 15 (45) rounds with new remm brass with the same load as above with very different velocity results, the temp was about 10 degrees cooler, and the pressure approx the same from the last session fist group 2865 mv, with ES of 41 2nd group 2801 mv ES 57 3rd group 2766 mv ES39 I have been meticulous with brass prep and weighting each load precisely on a beam scale assuming its not a faulty chrono (chrony master-beta) great name, it was very windy today though can muzzle velocity shift as the ambient temperature of the cartridge shifts to a higher or lower temp? would that change the ES ? would you expect a shift of over 100 fps from a change of 20 degrees or less? any input would be greatly appreciated . thanks in advance Scott [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
chrono speed, vs temperature
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