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Rifles, Reloading, Optics, Equipment
Reloading
Need guidance...case neck thickness
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<blockquote data-quote="RegionRat" data-source="post: 1566036" data-attributes="member: 57231"><p>The question about how to size the case neck for trimming is an important one, especially with three way cutters. </p><p>The chamfers are not going to come out right if the case neck diameter isn't the same as when the chamfer cuts were adjusted. So, basically you pick a sizing process first, and then adjust those trimmers to that diameter. The ones like the Giraud pilot on the shoulders and the case sizing is a factor since the tool doesn't index off the over all length. Even the tools that use a pilot for trimming, work well only when the case is already sized. The pilot clearance will be more consistent and the ones that chamfer are even more picky about the case neck diameter.</p><p></p><p>Reaming a case neck does come up with some circumstances. Specifically the ones where there is flow near the shoulder to neck junction and a "doughnut" forms. This pattern doesn't happen often, but when it does you have a hard time with bullets that need to go past that junction unless you ream.</p><p></p><p>The sizing process doesn't really care about the ID or OD concept. We tend to trim necks from the OD since it is far easier than getting a reamer to finish the length of the case neck. The brass will conform to the firing and sizing process either way.</p></blockquote><p></p>
[QUOTE="RegionRat, post: 1566036, member: 57231"] The question about how to size the case neck for trimming is an important one, especially with three way cutters. The chamfers are not going to come out right if the case neck diameter isn’t the same as when the chamfer cuts were adjusted. So, basically you pick a sizing process first, and then adjust those trimmers to that diameter. The ones like the Giraud pilot on the shoulders and the case sizing is a factor since the tool doesn’t index off the over all length. Even the tools that use a pilot for trimming, work well only when the case is already sized. The pilot clearance will be more consistent and the ones that chamfer are even more picky about the case neck diameter. Reaming a case neck does come up with some circumstances. Specifically the ones where there is flow near the shoulder to neck junction and a “doughnut” forms. This pattern doesn’t happen often, but when it does you have a hard time with bullets that need to go past that junction unless you ream. The sizing process doesn’t really care about the ID or OD concept. We tend to trim necks from the OD since it is far easier than getting a reamer to finish the length of the case neck. The brass will conform to the firing and sizing process either way. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Need guidance...case neck thickness
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