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Rifles, Reloading, Optics, Equipment
Reloading
Do I need FL sizing die?
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<blockquote data-quote="Mikecr" data-source="post: 747629" data-attributes="member: 1521"><p>FL sizing is a choice, but not a single choice.</p><p>The choices leading to FL sizing, or successful avoidance of it:</p><p>-Cartridge design</p><p>-Chamber body clearances</p><p>-Load pressure</p><p>-Amount of barrel steel around a chamber</p><p></p><p>CARTRIDGE DESIGN: large capacity cases with high body taper and low shoulder angles (like a 30-06) will have to be FL sized. </p><p>CHAMBER BODY CLEARANCES: On firing, cases hit and follow expanding chambers walls. Once pressure drops, the case and chamber walls spring back. With big clearances from 'new' case dimensions, firing will expand the brass to the point of yielding. These now larger cases are thinner by as much. Thinner cases spring back less, while the chamber springs back fully(it better), potentially leaving an interference fit.</p><p>High LOAD PRESSURE and insufficient BARREL STEEL AROUND CHAMBER go hand in hand at this point to do the same as excess clearances, even without excess clearances. </p><p>These conditions are chronic, and they are choices today.</p><p></p><p>Shoulder bumping is another subject, but similar in cause/effect and commonly needed. An added cause/choice directly contributing to this, is excess head spacing. </p><p></p><p>I don't and never will FL size, as this is among my choices.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 747629, member: 1521"] FL sizing is a choice, but not a single choice. The choices leading to FL sizing, or successful avoidance of it: -Cartridge design -Chamber body clearances -Load pressure -Amount of barrel steel around a chamber CARTRIDGE DESIGN: large capacity cases with high body taper and low shoulder angles (like a 30-06) will have to be FL sized. CHAMBER BODY CLEARANCES: On firing, cases hit and follow expanding chambers walls. Once pressure drops, the case and chamber walls spring back. With big clearances from 'new' case dimensions, firing will expand the brass to the point of yielding. These now larger cases are thinner by as much. Thinner cases spring back less, while the chamber springs back fully(it better), potentially leaving an interference fit. High LOAD PRESSURE and insufficient BARREL STEEL AROUND CHAMBER go hand in hand at this point to do the same as excess clearances, even without excess clearances. These conditions are chronic, and they are choices today. Shoulder bumping is another subject, but similar in cause/effect and commonly needed. An added cause/choice directly contributing to this, is excess head spacing. I don't and never will FL size, as this is among my choices. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Do I need FL sizing die?
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