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How much to turn necks?

 
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  #1  
Old 06-19-2006, 07:20 PM
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Location: Mouth of Hobble Crk Canyon, Utah
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How much to turn necks?

Have my 100 new Lapua 30-06 cases, FL sized on my Forster BR die and trimmed to SAAMI mins. Used my Sinclair Mic-4 neck thickness gage to get down to .0025" (gage reads to .001" but I can try to eyeball it to .0025"). Groups ran thusly.

.0000" to .0005 (6 cases)further referred to as .5 or less
.0006" to .001" (38 cases) referr as .6" to 1"
.001" to .0015" (29 cases) referr as 1" to 1.5"
.0016 to .002" (16 cases) referr as 1.6" to 2"
.002 and larger (11 cases) referr as 2" and larger

In playing with my worst 11 cases, the worst 2 being .003" neck wall variation. They are .0014" to .0017" and .0015" to .0018". Of all 100 cases, .0014" is the smallest and .0018" is the largest. What I'm trying to figure out is should I try and take all 100 cases down to .0014" so I aim for .0000" variation or maybe get .0015" at best.

Or, on my best 6 cases, the largest diamater is .0016"; should I try and take all 100 cases down to .0016"?

Thanks for the help!
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Old 06-19-2006, 08:12 PM
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Re: How much to turn necks?

Whats your neck diameter on the chamber?
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Old 06-19-2006, 08:57 PM
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Re: How much to turn necks?

Factory? SAAIM? I dunno [img]/ubbthreads/images/graemlins/smirk.gif[/img]

1982 Rem 700 ADL.

Big Al
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  #4  
Old 06-19-2006, 09:24 PM
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Re: How much to turn necks?

Just making sure on the decimal places.... youre saying your thinnest neck is .014", your thickest is .018" ? Saami is .340... so you will be right there. The easiest thing to do would be just hammer a round downrange, and slap a caliper on the fired neck. From that the answer is super easy. The whole goal of my tapdancing around giving an actual number revolves around wanting to keep expansion on firing as low as is practical to balance out sizing/work hardening the brass. Ive turned brass too thin to make it clean up before. worked great for all 3 firings [img]/ubbthreads/images/graemlins/smile.gif[/img] before the necks split. Measuring a fired round will make everything clear.
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Old 06-19-2006, 11:25 PM
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Re: How much to turn necks?

Abinok,

I understand perfectly. I'd hate to ruin a bacth of new Lapuas.

Yes, my thinest neck was .014" and the thickest was .018".
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  #6  
Old 06-20-2006, 07:50 AM
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Re: How much to turn necks?

The ones I toasted were norma (EEKS!!!)
taking the .018" to .014" adds .002" per side... and thats a lot if youve got a max dimension chamber. Im betting youve got .344-.346 or so... only one way to find out. Well, unless you want to cerrosafe it.
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  #7  
Old 06-20-2006, 09:14 AM
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Re: How much to turn necks?

Ok, just to soothe everyone’s curiosity, especially mine, before work this morning, I went and took 3 rounds and loaded them up with 57.5 gr H4350, WLR primers and stuck the bullets into the lands .005”. Temp about 65 degrees. The brass I used was in the .0016” to .002” neck thickness variation pile (16 cases). Not the worst of the bunch, but next to it.

Here is what happened.

Case 1

.0015” to .0017” neck thickness variation. Loaded OD .338”. Fired OD .341”

Case 2

.001425” to .001625”. Loaded OD .337”. Fired OD .341”

Case 3

.00155” to .00175”. Loaded OD .337”. Fired OD .341”.

Seems to me, and I could be wrong, I’m getting, at most, .004” expansion. Actually, probably .005” because I’m getting .001” spring back after firing; probably! Right?

Would I be safe to surmise (that’s my way of guessing) my chamber’s neck is .342”?

Ok, now where to from here?

Big Al

PS. Isn't this Fun?!?!?! [img]/ubbthreads/images/graemlins/grin.gif[/img]
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