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Outside neck dia. of loaded 25-06?

 
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  #1  
Old 08-21-2012, 05:01 PM
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Outside neck dia. of loaded 25-06?

Hey fellas, Am trying to order a bushing for a Redding S bushing fl die. The man at sinclair support said to measure the outside of a already loaded round and order that bushing size. He also stated that for my 25-06 it should be between .280-.283. When I got home I measured and am comming up with .284 on most rounds with an occasional .285 popping up. I am using WW super brass and 115gr bergers though the bullet should make no diffrence. Do any of yal have some rounds with this brass you could measure and tell if I'm on? Thank's, Brad
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Old 08-21-2012, 08:53 PM
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Re: Outside neck dia. of loaded 25-06?

Bullet diameter ((0.257" + (2 times neck wall thickness)) - .003").

If neck wall thickness = .010" it would be (.257" + .020) - .003" = .274".

If neck wall thickness = .015" it would be (.257 + .030) - .003 = .284".

Measure the thickness of the neck wall and buy accordingly.
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Old 08-21-2012, 11:46 PM
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Re: Outside neck dia. of loaded 25-06?

Your measurement is within reason. But, I disagree with the Sinclair tech.

If you just measure the loaded OD and get that bushing, I think you've got a problem because you would be sizing the ID to .257" not accounting for spring back. Hence, you'd likely end up with more than a few at .258" ID which is really bad.

Based on your .284" measurement, I'd order .280-.282" bushings expecting to use .281" with your current lot of brass.

-- richard
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Old 08-22-2012, 12:24 AM
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Re: Outside neck dia. of loaded 25-06?

Quote:
Originally Posted by rscott5028 View Post
Your measurement is within reason. But, I disagree with the Sinclair tech.

If you just measure the loaded OD and get that bushing, I think you've got a problem because you would be sizing the ID to .257" not accounting for spring back. Hence, you'd likely end up with more than a few at .258" ID which is really bad.

Based on your .284" measurement, I'd order .280-.282" bushings expecting to use .281" with your current lot of brass.

-- richard
Your suppose to subtract .001 from that reading. Or just buy a bunch keep the one you need send the rest back.
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Old 08-22-2012, 12:51 AM
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Re: Outside neck dia. of loaded 25-06?

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Originally Posted by chucknbach View Post
Your suppose to subtract .001 from that reading. Or just buy a bunch keep the one you need send the rest back.
Subtracting .001" is cutting it close with non-turned necks.

I would subtract .003" allowing for .001" spring back leaving you with an ID of .255" for most of your cases.

Smaller will lead to runout and larger may leave you with .257-.258" ID if your brass lot is not consistent.

I prefer to having extras on hand.

-- richard
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Old 08-22-2012, 03:56 PM
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Re: Outside neck dia. of loaded 25-06?

If I buy several sizes, how will I know which one is the right one I should be using? Brad
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Old 08-22-2012, 04:22 PM
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Re: Outside neck dia. of loaded 25-06?

Quote:
Originally Posted by RangerBrad View Post
If I buy several sizes, how will I know which one is the right one I should be using? Brad
Do the math above to identify the desired bushing.

Confirm by sizing and measuring the neck IDs.

You want the neck ID to be .001-.002" smaller than the bullet diameter.

Larger IDs may lead to loose bullets.

Smaller IDs won't improve neck tension, but it may cause increased runout as you seat bullets.

-- richard
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