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Old 05-15-2017, 04:34 PM   #1
bboswell
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Default Neck clearence

How much is needed?

I went with Lapua 30-06 brass to form my 280AI rounds, during sizing the necks thickened.

Reamer print shows 0.3156 so what should I turn the necks to?
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Old 05-15-2017, 07:47 PM   #2
Johnybenchrest
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Four thousands under be fine, need to measure a seated bullet
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Old 05-15-2017, 07:50 PM   #3
Cajun Blake
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single shot or repeater magazine feed ?

.004" for s.s. , and .006" for a repeater


follow the math .... I would go with .006" clearance ; .003" each side

loaded round should measure .309" ... use a .308" bushing

turn necks to .0125" ...... .0125" + .0125" + .284" = .309"



or listen to Johnny seat a bullet and mic the neck. Then start neck turning to desired thickness

Last edited by Cajun Blake; 05-15-2017 at 07:54 PM..
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Old 05-15-2017, 07:54 PM   #4
no1hogkiller
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I've trimmed 308 case necks down to .013. That cleaned the cases pretty good.
Have found some cases with various thicknesses, some .018 to .012.
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Old 05-15-2017, 07:55 PM   #5
kck
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What do the formed necks measure now? For a hunting rig I like to see 3 to 4 thou so maybe around .312. Have you been able to check a fired case out of that chamber? My straight 284 gives me a fired neck of .317 and my loaded round is .3135 +\- and shoots quite well just for reference.
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Old 05-15-2017, 10:03 PM   #6
bboswell
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Thanks guys, exactly what I needed!

Fired cases measure 0.315, formed brass with bullet seated measures the same so I will turn to 0.309 for this hunting rifle
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Old 05-15-2017, 10:14 PM   #7
Artos
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What...no PPC days Blake of turning .262 clearance to .261??

That is one thing I LOVE about the Norma brass & and my .311 Neck on the Borden .280ai. No more turning. All their brass is .001-.002 under. Pretty amazing. It's soft & doesn't last long with my hot loads, but who cares...it's no varmint rifle.

Quote:
Originally Posted by Cajun Blake View Post
single shot or repeater magazine feed ?

.004" for s.s. , and .006" for a repeater


follow the math .... I would go with .006" clearance ; .003" each side

loaded round should measure .309" ... use a .308" bushing

turn necks to .0125" ...... .0125" + .0125" + .284" = .309"



or listen to Johnny seat a bullet and mic the neck. Then start neck turning to desired thickness
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Old 05-15-2017, 10:21 PM   #8
Black Ice
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Quote:
Originally Posted by Johnybenchrest View Post
Four thousands under be fine, need to measure a seated bullet


Hey buddy where the hell have you been? I still love that 300 win mag you sold me


Sent from my iPhone using Tapatalk
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Old 05-18-2017, 09:51 AM   #9
Brute Killer
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Tag
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Old 05-18-2017, 06:23 PM   #10
meltingfeather
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Quote:
Originally Posted by Artos View Post
It's soft & doesn't last long with my hot loads
tee hee
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Old 05-18-2017, 07:07 PM   #11
Artos
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Quote:
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tee hee
touche...
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