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Long Range Hunting & Shooting
Fireforming and resizing
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<blockquote data-quote="dfanonymous" data-source="post: 2847712" data-attributes="member: 97050"><p>I mean, there's limits to what is defining of consistency in hand-loading and depending what you theories you subscribe to, can be quite tedious. Sometimes for not much gain.</p><p></p><p>You were kind of right in assuming that a FL resizing is SAAMI. This is because most chambers are SAAMI, and you're fireforming to the chamber. So yes, but because SAAMI is fairly loose tolerances (relative) and because of variations in machine tools and manufacturing, you're setting your FL die to bump back the shoulder just enough to close the bolt reliably while keeping it as close to its fire formed size. That's what most people mean who know anything about this mean by .002 bump.</p><p></p><p>The neck sizing however is meh. If you use a mandrel die, maybe a bushing die you can add setting neck tension into the same step. I don't have all day to mess around loading ammo, so I try to get in and out. A lot of guys here are retired and have no problem doing extra steps. The Lee collet dies can work good too.</p><p></p><p>Even then, if it's your second firing…the case will continue to change…that's when annealing comes in…</p><p>So it would be more like:</p><p>-FL resize virgin brass</p><p>-Fire form</p><p>-FL resize/bump</p><p>-Neck tension</p><p></p><p>Go shoot</p><p></p><p>-Anneal</p><p>-FL/bump</p><p>-Neck</p></blockquote><p></p>
[QUOTE="dfanonymous, post: 2847712, member: 97050"] I mean, there’s limits to what is defining of consistency in hand-loading and depending what you theories you subscribe to, can be quite tedious. Sometimes for not much gain. You were kind of right in assuming that a FL resizing is SAAMI. This is because most chambers are SAAMI, and you’re fireforming to the chamber. So yes, but because SAAMI is fairly loose tolerances (relative) and because of variations in machine tools and manufacturing, you're setting your FL die to bump back the shoulder just enough to close the bolt reliably while keeping it as close to its fire formed size. That’s what most people mean who know anything about this mean by .002 bump. The neck sizing however is meh. If you use a mandrel die, maybe a bushing die you can add setting neck tension into the same step. I don’t have all day to mess around loading ammo, so I try to get in and out. A lot of guys here are retired and have no problem doing extra steps. The Lee collet dies can work good too. Even then, if it’s your second firing…the case will continue to change…that’s when annealing comes in… So it would be more like: -FL resize virgin brass -Fire form -FL resize/bump -Neck tension Go shoot -Anneal -FL/bump -Neck [/QUOTE]
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Fireforming and resizing
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