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The Range
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Your favorite .308 load
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<blockquote data-quote="swampratt" data-source="post: 3341849" data-attributes="member: 15054"><p>Hodgdon done some testing on powders and temps and velocity changes.</p><p>Varget was 8 fps in .308 from 0-125 f.</p><p>AA2520 was 63 fps velocity spread.</p><p>IMR4064 was 46 fps RL15 was 50 fps spread</p><p>Win748 was 114 fps.</p><p>If you work up loads in the cold be sure to test them in the heat.</p><p></p><p>The velocity spread does not hurt my loading so much as group size changes do.</p><p>I load below max loads on most of my stuff.</p><p>Just be informed about pressures..</p><p>Velocity and pressures do not always follow the same upward path either.</p><p></p><p>I would really like to see pressure changes..I have read some AA2520 loads that were shot in the heat but worked up in the cold ended in pierced primers.</p><p>And very hard to open bolts.</p><p></p><p>Play safe with your reloading.</p><p><a href="https://www.hodgdon.com/wp-content/uploads/2018/06/hodgdon-extreme-series-powders-test-results-for-temperature-sensitivity.pdf" target="_blank">https://www.hodgdon.com/wp-content/uploads/2018/06/hodgdon-extreme-series-powders-test-results-for-temperature-sensitivity.pdf</a></p></blockquote><p></p>
[QUOTE="swampratt, post: 3341849, member: 15054"] Hodgdon done some testing on powders and temps and velocity changes. Varget was 8 fps in .308 from 0-125 f. AA2520 was 63 fps velocity spread. IMR4064 was 46 fps RL15 was 50 fps spread Win748 was 114 fps. If you work up loads in the cold be sure to test them in the heat. The velocity spread does not hurt my loading so much as group size changes do. I load below max loads on most of my stuff. Just be informed about pressures.. Velocity and pressures do not always follow the same upward path either. I would really like to see pressure changes..I have read some AA2520 loads that were shot in the heat but worked up in the cold ended in pierced primers. And very hard to open bolts. Play safe with your reloading. [URL]https://www.hodgdon.com/wp-content/uploads/2018/06/hodgdon-extreme-series-powders-test-results-for-temperature-sensitivity.pdf[/URL] [/QUOTE]
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