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How picky to get with new brass sorting

 
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  #1  
Old 10-27-2010, 09:13 PM
tlk tlk is offline
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How picky to get with new brass sorting

I got a new box of Lapua brass. Here is the breakdown on neck wall thickness dims only:

<0.001 (measured less than 0.015 and more than 0.014) - 33

0.001 (measured 0.015 - 0.014) - 22

>0.001 - 0.002 - 43

>0.002 - 2

So the question: I have separated out those that are less than 0.001 neck wall variance from those that are right at 0.001, but is there really any difference between the two? I will be using them for hunting and steel, 600 - 900 yards. No benchrest stuff, but would like to squeeze out everything I can from my setup.

Other question: would even be worth turning the neck on that first group? I usually turn my Lapua brass down to 0.014, but with that group, I dunno if my efforts would actually hurt more than help. Any experience/advice about this would be greatly appreciated.


Thanks.
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  #2  
Old 10-28-2010, 05:56 AM
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Re: How picky to get with new brass sorting

What cartridge?
How will you be sizing the cases?
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Old 10-28-2010, 06:48 AM
tlk tlk is offline
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Re: How picky to get with new brass sorting

30-06. I will be using a lee for the neck and a redding die to bump the shoulder.
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Old 10-28-2010, 09:53 AM
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Re: How picky to get with new brass sorting

With a factory chamber you will not gain very much by turning.
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Old 10-28-2010, 06:25 PM
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Re: How picky to get with new brass sorting

I'm picky in this area because I can't stand loaded cartridge runout. Just declaring that up front..
For you to measure, means you care about it, and your numbers look pretty typical to me.
For a very long and poorly designed case such as 30-06, runout from thickness variance grows seriously with each body cycle (firing/sizing). Trying to control runout here will only be a losing battle. And neck turning won't help at all.

I would use the 45 pieces exceeding 1thou variance, for brass prep setups only. Things like checks for trimmer, turner, uniforming, pilot deburring, chamfering, annealing, necksizing/tension, etc. Toss em in the trash after use, or immediately.

Keep and use the 1thou & under.
If you need more brass, buy twice as much more.
That's me though.
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Old 10-29-2010, 01:21 PM
tlk tlk is offline
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Re: How picky to get with new brass sorting

Mike, not wanting to be dense, but: are you saying that I shouldn't turn the good cases in order to make them all consistent?


Min saami chamber, if it makes any difference.
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  #7  
Old 10-29-2010, 02:45 PM
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Re: How picky to get with new brass sorting

I was suggesting that turning those >1thou wouldn't help with runout.
Within a few reloads it'll be right back.
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