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To turn or not (necks)

 
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  #1  
Old 04-14-2007, 09:04 PM
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To turn or not (necks)

I recently purchased 300 new Win 30-06 cases for my '06 Ackley. I culled them via a Sinclair Mic-4 neck wall thickness gage http://www.sinclairintl.com/cgi-bin/...amp;type=store

I was able to cull out 55 cases which had a neck thickness variation of .00075" or less. When reading Glen Zediker's book on reloading he suggests neck turning only the best cases to get them as close to zero runout as possible. I'm dying to turn them but wonder if my chamber's neck to too generous to really make a difference. The case necks are averaging .0013" thick.

My fired case necks are running .341". Sized via my Lee Collet neck die they run .332". A .009" difference.

.308" bullet diameter
.026" neck thickness .013 x 2
.334" total

What do you think of these numbers and whether or not I should turn my necks?
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  #2  
Old 04-14-2007, 10:19 PM
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Re: To turn or not (necks)

If you only have a variation of .00075 why whould you waste your time?
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Old 04-14-2007, 10:23 PM
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Re: To turn or not (necks)

Good question! That is one of the things, I'm struggling with. It's Glen Zediker that got me thinking about it. He turns the good stuff, not the less than good stuff.
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Old 04-14-2007, 11:08 PM
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Re: To turn or not (necks)

I doubt turning the necks on your particular brass would do much of anything at all advantageous. Glen suggests that he uses that good brass for matches because he figures if it has good consistency in the necks that it will have good consistency throughout the case and will give better results. In other words, he won't try and make a silk purse out of a sow's ear.

However, if your necks have a real thick side, they can be turned and still give good results. I believe in turning if there is more than .001" variation in neck thickness. Your brass is less than that so I wouldn't worry about it. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 04-14-2007, 11:14 PM
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Re: To turn or not (necks)

GG,

Again, thanks! So, turn the stuff which runs more than .001".
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Old 04-15-2007, 06:40 PM
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Re: To turn or not (necks)

are you using bushing dies?

If not, then you cannot neck turn.

If you have .009, IMO neck turning is a waste of time.

BH
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Old 04-15-2007, 10:01 PM
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Re: To turn or not (necks)

GSSP,
What kind of measuring equipment are you using??? sinclair or anything I have seen or used will barely measure to the 4th decimal point and your necks are .00075" how do you measure 75/100 thousandth. just curious
UB
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