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measuring cases to .0001

 
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  #1  
Old 04-01-2012, 06:22 AM
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Join Date: Oct 2003
Location: Forest Lake Minnesota
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measuring cases to .0001

Do any calipers measure to .0001?

If so which ones and if not, what tool do you use when wanting a ten thousandths measurement on case shoulder lengths where a micrometer is too short? I want to set bump die and want to know exactly where it is at.

Thanks for any replies much appreciated.

WS
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Old 04-01-2012, 06:51 AM
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Re: measuring cases to .0001

I have never used a bump die to set shoulder length but have adjusted full length die so that shoulder set-back was minimal in order to not overwork brass. I never cared what the measurement/dimensions were, as long as the case was kept as long as possible while letting the bolt or action close with little resistance. I don't know of any case length gauge being marketed that measures closer than .001" as all I have seen require a dial caliper to do the actual measurement.
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Dennis
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  #3  
Old 04-01-2012, 07:00 AM
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Re: measuring cases to .0001

I misspoke when I said bump die. I also use a full length die to set the shoulder back.

WS
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Old 04-01-2012, 07:15 AM
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Re: measuring cases to .0001

.0001"? April fool!
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  #5  
Old 04-01-2012, 08:06 AM
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Re: measuring cases to .0001

Sorry. However I am serious.

WS
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  #6  
Old 04-01-2012, 08:48 AM
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Location: S.E. Michigan
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Re: measuring cases to .0001

Good to be serious....

Also good to have a stuffed wallet.....

Starrett (and others) make micrometers in larger than 0-1". I have a set that measure 0.0001 (12"-13")....

I actually have a number of them in Starrett, Brown and Sharpe and Mititutoyo here and ionterestingly, I'm going to sell some at much less than stuffed wallet prices because they are used.

As a rule, dial calipers (or digital) suffice for larger than 1" dimensions in this shop, as a rule.

I have them nonetheless.....

I'll have to check the measuring ranges but shoot me a PM and I'll reply.
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  #7  
Old 04-01-2012, 10:32 AM
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Location: Allen, TX
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Re: measuring cases to .0001

You could set up a dial indicator similar to the Sinclair bullet sorting stand, but with a Hornady or similar headspace insert.

If you are that anal, you will likely need to shave the case heads square on virgin brass with a Wilson case trimer turned backwards. (a very delicate procedure that can be unsafe if done incorrectly) Then fireform, verify TIR to a similar degree of precision, discard 90% of your premium Lapua brass, resize, and then measure.

All this assumes your chamber and boltface are perfectly square.

Otherwise, the case head doesn't allow for a precise index point with that level of precision.

-- richard
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