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Rifles, Reloading, Optics, Equipment
Reloading
Neck sizing
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<blockquote data-quote="Mikecr" data-source="post: 865813" data-attributes="member: 1521"><p>Well regardless of what the herd does, the fact remains that FL sizing is not always required or employed. I've never seen anyone prove that partial neck sizing, with a shoulder bump, is any less accurate than that of FL sized cases. I highly doubt this will ever be demonstrated.</p><p>And there are advantages to a well worked out plan in neck sizing. For one, FL sized cases hold way more runout than neck sized only. Neck sized grow less, and require less trimming, so capacity holds longer. Bushing dies partial neck size so they don't bring donuts into play so much, and they're not introducing tension variance with all the overworking of neck area below bullet bearing.</p><p>And best of all, with NS/bump I can make 100pcs of Lapua brass last 6 lifetimes, so I don't care what they charge for it!</p><p></p><p>A grand work-around for the details in reloading -is pressure. Given enough of it, cases can be crooked as hell and vary badly in capacity & neck tension, and still shoot tight groups. It's a popular function of competitive cartridges to reach enough pressure to shoot competitively.</p><p>Drop the pressure on a 6PPC for example, and it shows a less than super cartridge character.</p><p>Crank the pressure up to a higher/wider tune, and now it shoots again, but:</p><p>-The cases won't last long</p><p>-You have no choice but to FL size them back into machine gun loading speeds(between conditions)</p><p>This both directly and indirectly leads to the vast majority of competitors FL sizing, and continually replacing brass(whether they realize it or not). It works well for them.</p><p></p><p>Where competition produces 1/2moa only with anomolies, competitors could back off on pressure a bit & use better capacities for bullets instead of under capacities. This is where they could maintain stable brass for many reloads, with partial NS/bump. And it could give them an edge over those constantly munging up their brass.</p><p>Where they're shooting larger over capacity cartridges, well they can't take advantage of extreme pressures anyway, so there is no gain in trashing their brass otherwise(through excess sizing).</p><p>The exception here, is chosen cartridges that are poor in design. They will have to be FL sized no matter what, and they rarely represent competition to a better field. This is the guy showing up with a 270..</p><p></p><p>As far as competition, and what competitors do, as a basis, this has a lot more to do with format, conditions, and shooter skills -than case sizing. Competitive trends are a continually moving target.</p><p>This is a long range HUNTING site. It's not about format, sighters, rests, grouping and competition. It's about single shot accuracy.</p><p>Getting a good case life plus very consistent capacities and low runout, can't hurt a thing for hunters. And IMO, with a good cartridge design, hunters would be better served to run rational loads, and pick up a bushing die for necks, a Redding body die for bumping, and a Sinclair mandrel die for neck expansion. Precision bullet seating with a Wilson & arbor press.</p><p>You won't be replacing anymore brass, and you'll shoot just as good as load development leads for your system.</p><p>But it's my opinion, and I think there are many qualifiers to consider before choosing the best sizing path.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 865813, member: 1521"] Well regardless of what the herd does, the fact remains that FL sizing is not always required or employed. I've never seen anyone prove that partial neck sizing, with a shoulder bump, is any less accurate than that of FL sized cases. I highly doubt this will ever be demonstrated. And there are advantages to a well worked out plan in neck sizing. For one, FL sized cases hold way more runout than neck sized only. Neck sized grow less, and require less trimming, so capacity holds longer. Bushing dies partial neck size so they don't bring donuts into play so much, and they're not introducing tension variance with all the overworking of neck area below bullet bearing. And best of all, with NS/bump I can make 100pcs of Lapua brass last 6 lifetimes, so I don't care what they charge for it! A grand work-around for the details in reloading -is pressure. Given enough of it, cases can be crooked as hell and vary badly in capacity & neck tension, and still shoot tight groups. It's a popular function of competitive cartridges to reach enough pressure to shoot competitively. Drop the pressure on a 6PPC for example, and it shows a less than super cartridge character. Crank the pressure up to a higher/wider tune, and now it shoots again, but: -The cases won't last long -You have no choice but to FL size them back into machine gun loading speeds(between conditions) This both directly and indirectly leads to the vast majority of competitors FL sizing, and continually replacing brass(whether they realize it or not). It works well for them. Where competition produces 1/2moa only with anomolies, competitors could back off on pressure a bit & use better capacities for bullets instead of under capacities. This is where they could maintain stable brass for many reloads, with partial NS/bump. And it could give them an edge over those constantly munging up their brass. Where they're shooting larger over capacity cartridges, well they can't take advantage of extreme pressures anyway, so there is no gain in trashing their brass otherwise(through excess sizing). The exception here, is chosen cartridges that are poor in design. They will have to be FL sized no matter what, and they rarely represent competition to a better field. This is the guy showing up with a 270.. As far as competition, and what competitors do, as a basis, this has a lot more to do with format, conditions, and shooter skills -than case sizing. Competitive trends are a continually moving target. This is a long range HUNTING site. It's not about format, sighters, rests, grouping and competition. It's about single shot accuracy. Getting a good case life plus very consistent capacities and low runout, can't hurt a thing for hunters. And IMO, with a good cartridge design, hunters would be better served to run rational loads, and pick up a bushing die for necks, a Redding body die for bumping, and a Sinclair mandrel die for neck expansion. Precision bullet seating with a Wilson & arbor press. You won't be replacing anymore brass, and you'll shoot just as good as load development leads for your system. But it's my opinion, and I think there are many qualifiers to consider before choosing the best sizing path. [/QUOTE]
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