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Old November 17, 2012, 04:30 PM   #1
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308 neck sizing / coal question

Just reloaded a batch of 308 rounds that were neck sized for my bolt gun and noticed an issue with the COAL. The casings in question are once fired Lapua that I Full Length resized for the first reload so I could fire form them to my chmaber. When I reloaded them using the Full Length I seated the bullets at 2.800 which I understand that it will vary +/- .005 depending on the tip of the bullet it self. Now that I neck sized the same casings and loaded them up......I noticed that the COAL is 2.808-2.817. Is it possible that I have to re-adjust my seating die now that I'm Neck Sizing???? I double checked my seating die using a dummy round that measured 2.800 and it was right on the dot. Kinda new to the whole neck sizing thing so any advice will be greatly appreciated. Thanks.
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Old November 17, 2012, 07:47 PM   #2
Bart B.
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Once a bullet seating stem's set and locked, there should be no difference in OAL regardless of how the fired case was sized. This assumes there's no interference between either case and the seater die body's dimensions.

My guess is the seating die wasn't screwed all the way down. If it was and you just screwed the seating stem down on your test round and stopped when the least contact was made, that might have caused the difference.

Last edited by Bart B.; November 17, 2012 at 08:01 PM.
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Old November 17, 2012, 11:56 PM   #3
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COAL is 2.808-2.817, which is 2.8115 +/- 0.0035

You are fine.

Machine guns are awesome until you have to carry one.
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Old November 18, 2012, 11:21 AM   #4
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What Bart said.
Unless you've changed bullets, the seating die doesn't know anything about the brass under the bullet.
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Old November 18, 2012, 11:40 AM   #5
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I didn't see anywhere where you trimmed all brass to the same length . It's important to have all brass the same length , when neck sizing . I usually trim brass that I'm going to neck size , .010" shorter than recommended trim to length in the manuals . Depending on a few variables , you should be able to get 5-10 reloads before needing to trim again !
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Old November 18, 2012, 12:28 PM   #6
Bart B.
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I don't think even a .015" spread in case length matters. It'll cause a tiny spread in neck tension on bullets that is well masked by other variables.
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