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Rifles, Reloading, Optics, Equipment
Reloading
Loaded up my first hammers this evening
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<blockquote data-quote="just_jon" data-source="post: 2711881" data-attributes="member: 112153"><p>In case ButterBean is otherwise occupied, I ran the QL wizard for you just so you're not stepping off the lunar module blind. The results (attached) predicts max pressure at 62.9 grains for H380 and 67.8 grains for H4350. This data was derived using a weighting factor of .33 (recommended for overbore bottleneck cartridges) and a shot start (initiation) pressure of 6525 psi (recommended for solid copper bullets). I've sent a bunch of hammers down range, including the 75 HH in my 250AI, by adjusting these two settings along with my actual cartridge length and H20 capacity and have found I can generally exceed the QL predicted max by as much as a grain (slightly more in larger capacity cartridges) before seeing pressure signs beyond slightly flattened primers. That said, I have no personal experience with the 257 bee or H380 in cartridges larger than 22-250. </p><p></p><p>Good luck out there and be safe.</p><p></p><p>"And I think it's gonna be a long, long time</p><p>'Till touch down brings me 'round again to find</p><p>I'm not the man they think I am at home</p><p>Oh no, no, no</p><p>I'm a rocket man</p><p>Rocket man burning out his fuse up here alone"</p><p></p><p> - Rocket Man by Elton John</p></blockquote><p></p>
[QUOTE="just_jon, post: 2711881, member: 112153"] In case ButterBean is otherwise occupied, I ran the QL wizard for you just so you're not stepping off the lunar module blind. The results (attached) predicts max pressure at 62.9 grains for H380 and 67.8 grains for H4350. This data was derived using a weighting factor of .33 (recommended for overbore bottleneck cartridges) and a shot start (initiation) pressure of 6525 psi (recommended for solid copper bullets). I've sent a bunch of hammers down range, including the 75 HH in my 250AI, by adjusting these two settings along with my actual cartridge length and H20 capacity and have found I can generally exceed the QL predicted max by as much as a grain (slightly more in larger capacity cartridges) before seeing pressure signs beyond slightly flattened primers. That said, I have no personal experience with the 257 bee or H380 in cartridges larger than 22-250. Good luck out there and be safe. "And I think it's gonna be a long, long time 'Till touch down brings me 'round again to find I'm not the man they think I am at home Oh no, no, no I'm a rocket man Rocket man burning out his fuse up here alone" - Rocket Man by Elton John [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Loaded up my first hammers this evening
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