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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Burn Rate mystery
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<blockquote data-quote="Kennibear" data-source="post: 909791" data-attributes="member: 51650"><p>Be VERY careful about assumptions! Pressure has a HUGE effect on powder burn rate! Some speed up at 40Kpsi - 50Kpsi and others hold steady until 65Kpsi. Pistol/shotgun powders can go nuts as low as 30Kpsi. That's why there is only a general relationship to burning rate. Powders like Superformance and Leverevolution are even more specific. H4831 was designed around the original burn rate of the surplus stocks that Hodgdon's sold in the '50s. IMR 4831 was the update DuPont came out with decades later just like H4895/IMR4895 except those two are closer in burn rate.</p><p></p><p>I use the burn rate charts all the time but I start low and inch up <strong><em>real slow like!</em></strong></p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 909791, member: 51650"] Be VERY careful about assumptions! Pressure has a HUGE effect on powder burn rate! Some speed up at 40Kpsi - 50Kpsi and others hold steady until 65Kpsi. Pistol/shotgun powders can go nuts as low as 30Kpsi. That's why there is only a general relationship to burning rate. Powders like Superformance and Leverevolution are even more specific. H4831 was designed around the original burn rate of the surplus stocks that Hodgdon's sold in the '50s. IMR 4831 was the update DuPont came out with decades later just like H4895/IMR4895 except those two are closer in burn rate. I use the burn rate charts all the time but I start low and inch up [B][I]real slow like![/I][/B] KB [/QUOTE]
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Burn Rate mystery
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