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Rifles, Reloading, Optics, Equipment
Reloading
US869 Data
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<blockquote data-quote="Jon A" data-source="post: 88629" data-attributes="member: 319"><p>I don't understand why the stopped at such low pressures for so many cartridges. If you look at the 300 RUM data, except for the 200 grain load (using that bullet it's worthless data anyway), those are <em>starting load pressures.</em></p><p></p><p>The best example is the 220 grain load. From their current manual:</p><p></p><p><strong>Starting load</strong> for H870: 101 grains, 2818 fps, 54,800 psi.</p><p></p><p><strong>Max load</strong> for US869: 101 grains, 2875, 55,200 psi.</p><p></p><p>The good news is it looks like in this round with heavy bullets the <em>same</em> powdercharge results in basically the <em>same</em> pressure but nearly 60 fps more velocity.</p><p></p><p>Looks like it has potential to me. The only question is why they stopped at 101 grains--it certainly wasn't because of pressure. I have a hard time believing they couldn't fit more than 101 grains of ball powder into the case....</p><p></p><p>Oh well, if it's as accurate and consistent as H870 was and is really temperature stable, I'd be happy if it can just come fairly close to the velocities H870 provided as nothing I've found that satisfies the above can.</p><p></p><p>So if you look closely enough at the data, I think it looks pretty promising. Also, except for the Weatherbys and BMG, all those are from a 24" barrel.</p></blockquote><p></p>
[QUOTE="Jon A, post: 88629, member: 319"] I don't understand why the stopped at such low pressures for so many cartridges. If you look at the 300 RUM data, except for the 200 grain load (using that bullet it's worthless data anyway), those are [i]starting load pressures.[/i] The best example is the 220 grain load. From their current manual: [b]Starting load[/b] for H870: 101 grains, 2818 fps, 54,800 psi. [b]Max load[/b] for US869: 101 grains, 2875, 55,200 psi. The good news is it looks like in this round with heavy bullets the [i]same[/i] powdercharge results in basically the [i]same[/i] pressure but nearly 60 fps more velocity. Looks like it has potential to me. The only question is why they stopped at 101 grains--it certainly wasn't because of pressure. I have a hard time believing they couldn't fit more than 101 grains of ball powder into the case.... Oh well, if it's as accurate and consistent as H870 was and is really temperature stable, I'd be happy if it can just come fairly close to the velocities H870 provided as nothing I've found that satisfies the above can. So if you look closely enough at the data, I think it looks pretty promising. Also, except for the Weatherbys and BMG, all those are from a 24" barrel. [/QUOTE]
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