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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Improved 40 degree with print. Which design is better?
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<blockquote data-quote="Pdvdh" data-source="post: 1082987" data-attributes="member: 4191"><p>If you outside neck turn to just barely clean up the neck, then 0.370" will be good for the neck OD. If not outside neck turning, you'll want to use 0.372" OD on the neck with factory Lapua cases.</p><p></p><p>Your shoulder OD dimension "E" of 0.570" is pushing it for case body taper. Nathan Dagley's reamer spec sheet used 0.569". I went with 0.562"diameter at the case shoulder. If you don't have enough taper to the casing from case head to case shoulder, case extraction can become difficult/problematic. So you could discuss this with your chamber reamer supplier, but I would reduce the 0.570" shoulder OD to something more like 0.565", to help ensure you don't have difficult case extraction problems.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1082987, member: 4191"] If you outside neck turn to just barely clean up the neck, then 0.370" will be good for the neck OD. If not outside neck turning, you'll want to use 0.372" OD on the neck with factory Lapua cases. Your shoulder OD dimension "E" of 0.570" is pushing it for case body taper. Nathan Dagley's reamer spec sheet used 0.569". I went with 0.562"diameter at the case shoulder. If you don't have enough taper to the casing from case head to case shoulder, case extraction can become difficult/problematic. So you could discuss this with your chamber reamer supplier, but I would reduce the 0.570" shoulder OD to something more like 0.565", to help ensure you don't have difficult case extraction problems. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Improved 40 degree with print. Which design is better?
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