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Rifles, Reloading, Optics, Equipment
Reloading
Unburnt powder when reloading hammers?
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<blockquote data-quote="QuietTexan" data-source="post: 2652505" data-attributes="member: 116181"><p>Faster powder, spherical powder, or live with it if it shoots. Heavy crimp only works to a point to try to increase starting pressure, so since you're compressed already if a 3/8 crimp doesn't make a significant improvement then move to a spherical and/or faster powder.</p><p></p><p>The bore is so large vis-a-vis case volume that pressure falls off much faster than the same case volume in a smaller bore, that's what causing partial burn of the kernels. Using IMR 4198 the bullet is ~3" down the barrel when pressure drops enough to affect burn. Running IMR 4227 (faster) and H CFE BLK (faster/spherical) the burn is much more complete in the first 1" of barrel, so the increased volume cause by the large bore diameter doesn't as much an effect to kill the burn sooner.</p><p></p><p>Look at how the red pressure curve narrows with the faster/spherical powders. I set the loads up so that they all get to the ~30k pressure line - velocity doesn't drastically change with any of these choices, just the timing of pressure before the bullet moves down the bore and increases volume.</p><p></p><p>All the normal powders for heavy subs should work to some extent here - IMR 4227, H110, Lil'Gun, SW Blackout, CFE BLK. Some will have lighter densities than others, I would stay with ones that are on the 101% side and not the 80% side, but that's because I like to crush the powder column slightly under Hammers in general.</p><p></p><p>[ATTACH=full]406212[/ATTACH]</p><p>[ATTACH=full]406213[/ATTACH]</p><p>[ATTACH=full]406214[/ATTACH]</p><p>[ATTACH=full]406215[/ATTACH]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2652505, member: 116181"] Faster powder, spherical powder, or live with it if it shoots. Heavy crimp only works to a point to try to increase starting pressure, so since you're compressed already if a 3/8 crimp doesn't make a significant improvement then move to a spherical and/or faster powder. The bore is so large vis-a-vis case volume that pressure falls off much faster than the same case volume in a smaller bore, that's what causing partial burn of the kernels. Using IMR 4198 the bullet is ~3" down the barrel when pressure drops enough to affect burn. Running IMR 4227 (faster) and H CFE BLK (faster/spherical) the burn is much more complete in the first 1" of barrel, so the increased volume cause by the large bore diameter doesn't as much an effect to kill the burn sooner. Look at how the red pressure curve narrows with the faster/spherical powders. I set the loads up so that they all get to the ~30k pressure line - velocity doesn't drastically change with any of these choices, just the timing of pressure before the bullet moves down the bore and increases volume. All the normal powders for heavy subs should work to some extent here - IMR 4227, H110, Lil'Gun, SW Blackout, CFE BLK. Some will have lighter densities than others, I would stay with ones that are on the 101% side and not the 80% side, but that's because I like to crush the powder column slightly under Hammers in general. [ATTACH type="full" alt="imr .jpg"]406212[/ATTACH] [ATTACH type="full" alt="IMR 4198.jpg"]406213[/ATTACH] [ATTACH type="full" alt="IMR 4227.jpg"]406214[/ATTACH] [ATTACH type="full" alt="H CFE BLK.jpg"]406215[/ATTACH] [/QUOTE]
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Reloading
Unburnt powder when reloading hammers?
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