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Rifles, Reloading, Optics, Equipment
Reloading
Usually on the giving end of advice...need help
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<blockquote data-quote="Hugnot" data-source="post: 2645519" data-attributes="member: 115658"><p>I don't think 40-65 fps spreads (about 2%) are that extreme for a large capacity to small bore case like the 6mm-284. Searching for a combo that might reduce spreads, try a magnum primer.</p><p></p><p>Different primers produce different energy levels.</p><p></p><p>[URL unfurl="true"]https://arxiv.org/ftp/arxiv/papers/1203/1203.2701.pdf[/URL]</p><p></p><p>The graph, fig 2, gives an indication of primer strength.</p><p></p><p>For large capacity to bore size using slow burning powders, I like Fed 215's & CCI 250's (LRP).</p><p></p><p>RL 26 is touted as having Alliant's EI technology that states the deterrents are imbedded or infused into powder grains rather than coating the grains with deterrents. This feature might require a hotter primer than the much less dense, deterrent coated H1000. The imbedded or infused deterrents are claimed to provide a more sustained energy or pressure increase to provide higher velocities.</p><p></p><p>As mentioned above ^^, try another powder, I have seen some H4831SC and VN 165 available online. Either that, try a magnum primer like CCI250 or Fed 215 primers. Loads using H1000 & CCI 200's gave extremely low velocity spreads & great accuracy in my 6.5-06. Possibly, you might be able to scrounge up some H1000. All my VN 165 loads use standard LRP's and have low velocity spreads.</p><p></p><p>Turning necks and maintaining neck tension are important^^. Having a nice slip fit of bullet into fired brass would indicate enough neck/chamber clearance, like .004. I turn my 6mm necks to .268.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2645519, member: 115658"] I don't think 40-65 fps spreads (about 2%) are that extreme for a large capacity to small bore case like the 6mm-284. Searching for a combo that might reduce spreads, try a magnum primer. Different primers produce different energy levels. [URL unfurl="true"]https://arxiv.org/ftp/arxiv/papers/1203/1203.2701.pdf[/URL] The graph, fig 2, gives an indication of primer strength. For large capacity to bore size using slow burning powders, I like Fed 215's & CCI 250's (LRP). RL 26 is touted as having Alliant's EI technology that states the deterrents are imbedded or infused into powder grains rather than coating the grains with deterrents. This feature might require a hotter primer than the much less dense, deterrent coated H1000. The imbedded or infused deterrents are claimed to provide a more sustained energy or pressure increase to provide higher velocities. As mentioned above ^^, try another powder, I have seen some H4831SC and VN 165 available online. Either that, try a magnum primer like CCI250 or Fed 215 primers. Loads using H1000 & CCI 200's gave extremely low velocity spreads & great accuracy in my 6.5-06. Possibly, you might be able to scrounge up some H1000. All my VN 165 loads use standard LRP's and have low velocity spreads. Turning necks and maintaining neck tension are important^^. Having a nice slip fit of bullet into fired brass would indicate enough neck/chamber clearance, like .004. I turn my 6mm necks to .268. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Usually on the giving end of advice...need help
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