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Rifles, Reloading, Optics, Equipment
Reloading
Pulling bullets / Reseating / Neck Tension
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<blockquote data-quote="Mikecr" data-source="post: 812627" data-attributes="member: 1521"><p>The steepest shoulder angle I'm running right now is 35deg. With this, I do eventually have to bump shoulders, and forever more once I do.</p><p>But shoulder bumping in itself is nothing like FL sizing.</p><p></p><p>FL sizing begins near the webs and works it's way up a case as it enters further in the die. It's like squeezing a toothpaste tube, moving brass up toward/into the necks, lengthening them, causing a need to trim. FL sizing is re-forming.</p><p>Shoulder bumping with ~30deg and better angles, does not roll brass, it just pushes it inward.</p><p></p><p>The reason cartridges with low shoulder angles and high body tapers grow so much in firing(even with tight headspace), is wedging, as THIS chamber presents no hard stopping point for case dimensions. A perfect example of such a terrible design(w/resp to reloading) is the 30-06.</p><p>'Improved' cartridge really means improved over any 30-06 baseline design(ex; 243Win to 243AI, or 6XC, etc). These are easier to hold in a stable performing condition, reload after reload.</p><p>Something like a 30-06, 270, etc, grows on each firing, and has to be FL sized to rechamber(not just bumped).</p><p></p><p>WOODS:. Springback always occurs opposite the last action. It doesn't all occur at once though, but maybe 85% of it right away. The rest occurs further in the springback direction -over time. Springback happens everywhere brass is squeezed or expanded including primer pockets.</p><p>So for hunting ammo, I let sized/primed brass set for 2wks before testing/setting seating forces, resetting primer crush, and loading. Then I test a sample of this to be sure I'm right for the trip.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 812627, member: 1521"] The steepest shoulder angle I'm running right now is 35deg. With this, I do eventually have to bump shoulders, and forever more once I do. But shoulder bumping in itself is nothing like FL sizing. FL sizing begins near the webs and works it's way up a case as it enters further in the die. It's like squeezing a toothpaste tube, moving brass up toward/into the necks, lengthening them, causing a need to trim. FL sizing is re-forming. Shoulder bumping with ~30deg and better angles, does not roll brass, it just pushes it inward. The reason cartridges with low shoulder angles and high body tapers grow so much in firing(even with tight headspace), is wedging, as THIS chamber presents no hard stopping point for case dimensions. A perfect example of such a terrible design(w/resp to reloading) is the 30-06. 'Improved' cartridge really means improved over any 30-06 baseline design(ex; 243Win to 243AI, or 6XC, etc). These are easier to hold in a stable performing condition, reload after reload. Something like a 30-06, 270, etc, grows on each firing, and has to be FL sized to rechamber(not just bumped). WOODS:. Springback always occurs opposite the last action. It doesn't all occur at once though, but maybe 85% of it right away. The rest occurs further in the springback direction -over time. Springback happens everywhere brass is squeezed or expanded including primer pockets. So for hunting ammo, I let sized/primed brass set for 2wks before testing/setting seating forces, resetting primer crush, and loading. Then I test a sample of this to be sure I'm right for the trip. [/QUOTE]
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Pulling bullets / Reseating / Neck Tension
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