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Outside neck dia. of loaded 25-06?

 
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  #8  
Old 08-22-2012, 05:28 PM
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Join Date: Jul 2011
Location: Gillette, Wy
Posts: 241
Re: Outside neck dia. of loaded 25-06?

From RCBS instuction manual

NECK BUSHING SELECTION
Neck bushings are not included. Proper neck bushing size
can be determined two ways. Measure the outside neck
diameter of a sample loaded cartridge, subtract .002" to
.003". This allows approximately .001" of brass spring
back for correct neck tension. The other is to measure the
neck wall thickness of your case, multiply by two, add the
diameter of your bullet and subtract .001". For example:
loaded case neck diameter is .333-.002=.331 neck bushing
or .012 case neck thickness, .308 diameter bullet is
.012+.012+.308 =.332-.001=.331 neck bushing. RCBS
suggests that you have neck bushings one to two sizes
above and below your target diameter.

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  #9  
Old 08-22-2012, 05:30 PM
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Re: Outside neck dia. of loaded 25-06?

Quote:
Originally Posted by rscott5028 View Post
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
You are correct, I was going off my memory which isn't to good, apparently.
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  #10  
Old 08-23-2012, 01:20 PM
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Re: Outside neck dia. of loaded 25-06?

IMO the bushing dies should be used with non-factory bbl's. Even so, I dont believe in the neck tension theory, I believe you get more out of a standard neck sizing die such as Lee, or some of the newer full length custom dies, depending on your rifle ..
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  #11  
Old 08-23-2012, 01:25 PM
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Location: Allen, TX
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Re: Outside neck dia. of loaded 25-06?

Quote:
Originally Posted by lever-hed View Post
IMO the bushing dies should be used with non-factory bbl's. Even so, I dont believe in the neck tension theory, I believe you get more out of a standard neck sizing die such as Lee, or some of the newer full length custom dies, depending on your rifle ..
What is your description of the "neck tension theory?"

Do you not believe that neck tension exists?
Or, that it doesn't need to be consistent?
Or, that it doesn't matter?

-- richard
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  #12  
Old 08-23-2012, 07:55 PM
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Join Date: Dec 2010
Location: Booneville, Ar
Posts: 290
Re: Outside neck dia. of loaded 25-06?

Found a new problem. I measured the neck thickness of my used brass and it shows .013 which would give me a loaded out side neck diameter of .283 which is really close to my measured out side diameter of .284

Then I measured my new virgin brass neck thickness and it measured .016 which should give me a loaded out side neck diameter of .289

This is a diffrence of .005, these measurments were taken with a regular set of calipers however, the used brass measured just what I expected it to.

According to this I would have to re-measure and install a new bushing at $15 a piece, after every few reloads.

This is also outside of what the sinclair tech. stated it should be which was .280-.284.

What say yal to this? Brad
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  #13  
Old 08-24-2012, 07:40 AM
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Posts: 420
Re: Outside neck dia. of loaded 25-06?

Quote:
Originally Posted by RangerBrad View Post
What say yal to this? Brad
Neck turn, I would rather have the necks too thick on new brass than too thin, then you have the option at least.

Bob
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  #14  
Old 08-24-2012, 08:32 AM
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Join Date: Dec 2006
Posts: 29
Re: Outside neck dia. of loaded 25-06?

All good info, just want to mention a couple things I didn't see brought up. First, some of the $20 calipers aren't great, and measuring with the knife edges takes some practice. I like using a regular micrometer on case necks. Second, not all .257" bullets are .25700". With as many variables involved here, the numbers can stack either direction enough to require a bushing change for a bullet/case batch. Neck turning helps remedy some of that.

It does get down to how much neck tension you want, how much neck re-working you want going on and how anal you want to be about it. Some of us enjoy chasing the ultimate, but there is a point of diminishing returns. Really good match and hunting ammo is made all the time without worrying about .001" of additional tension. Loose is no good obviously.
Wallypedal
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