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Rifles, Reloading, Optics, Equipment
Reloading
Interpreting Pressure Signs from Velocity (260 Remington load dev)
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<blockquote data-quote="scottishkat" data-source="post: 1397731" data-attributes="member: 82202"><p>1Moose I will offer this along with above. The Nosler data indicates max of H1000 at 50 grains with Nosler brass the hornady data indicates a max of 49.6 with remington brass. Remington brass weight averages 161 grains per case. The nosler brass I have weights 166 grains per case. Lapua brass weights 173 grains per case.</p><p></p><p>All this can explain some of your velocity issues heavier brass can translate to lower case capacity and greater pressure during firing hence greater velocity. The best way to check is to prime a case and fill with water and measure it to see the difference in actual capacity.</p><p></p><p>The nosler data indicates 50 grains max and 2785 fps. You may have an anomaly with the chronograph or a faster barrel.</p><p></p><p>In any case as explained above I don't think you can fit enough H1000 in a case to go over pressure it's rather unique in that way.</p><p></p><p>How is your accuracy at 47.8 gr you have an extreme spread of 10 fps and there is nothing wrong with that. Measure a few cases before firing and after firing above the case head and see how much expansion your are getting. This will be a better indicator than looking for pressure signs.</p><p></p><p>Noslers minimum data is 46 gr for 2596 and 48 gr for 2686 and above. Your load is about 70 fps over Nosler. I would increase as you have and see if ES improves. In all probability you will be able to increase until you get case deformation from powder compression this will generally happen at the shoulder but you can measure for this as well.</p><p></p><p>I hope this helps.</p><p></p><p>Good luck and shoot straight</p><p></p><p>Bob</p></blockquote><p></p>
[QUOTE="scottishkat, post: 1397731, member: 82202"] 1Moose I will offer this along with above. The Nosler data indicates max of H1000 at 50 grains with Nosler brass the hornady data indicates a max of 49.6 with remington brass. Remington brass weight averages 161 grains per case. The nosler brass I have weights 166 grains per case. Lapua brass weights 173 grains per case. All this can explain some of your velocity issues heavier brass can translate to lower case capacity and greater pressure during firing hence greater velocity. The best way to check is to prime a case and fill with water and measure it to see the difference in actual capacity. The nosler data indicates 50 grains max and 2785 fps. You may have an anomaly with the chronograph or a faster barrel. In any case as explained above I don't think you can fit enough H1000 in a case to go over pressure it's rather unique in that way. How is your accuracy at 47.8 gr you have an extreme spread of 10 fps and there is nothing wrong with that. Measure a few cases before firing and after firing above the case head and see how much expansion your are getting. This will be a better indicator than looking for pressure signs. Noslers minimum data is 46 gr for 2596 and 48 gr for 2686 and above. Your load is about 70 fps over Nosler. I would increase as you have and see if ES improves. In all probability you will be able to increase until you get case deformation from powder compression this will generally happen at the shoulder but you can measure for this as well. I hope this helps. Good luck and shoot straight Bob [/QUOTE]
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Interpreting Pressure Signs from Velocity (260 Remington load dev)
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