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Link
Reply with quote  #1 
I was looking at the 223 page and it gives a measurement of .253
with the bullet seated at the neck. [neck diam.]

I measured one at the local gun shop and it was .2495 with lapua brass.

What's up with that? What do you guys get on yours?

thanks Link
SNAFUBAR
Reply with quote  #2 
I just measured 3 randomly from the loads I finished tonight.....mine are all .2495 as well (Lapua twice fired brass loaded with 80g Bergers)
fdshuster
Reply with quote  #3 
Link: The dimensions shown on the 223 page are all maximum ctg. dimensions that can be chambered in a SAAMI spec chamber. As an example, case length is shown as 1.7598", and we all "round up" to 1.760". Same for ctg O.A.L., shown as 2.2598"/ rounded up to 2.260". Every commercial 22 c.f. chamber neck dia. I've ever measured is .256"/.257", so again, the .2532" would "fit". And, yes, my Lapua 223 loaded neck diameters are around .249"/.2495", the reason my spec'ed chambering reamers include a neck diameter of .253", a good dia. for a tight, no-turn neck. Loaded 223 with Winchester brass will have a neck dia. of approx. .246" for a really sloppy fit in a "large" chamber. Good observations on your part: you are on top of it.
Link
Reply with quote  #4 
MMmmmm Thanks guys.

The reason for asking is I want to order my neck dies with the bushing. Should I order 2 bushings?
1 at .247 for the Lapua that measures .2495
& 1 at .244 for the L.C. brass?

And as for the neck size in my new chamber maybe a .252 or .253?

this is a .223 A.I. I am having built for my Contender.

thanks again.
fdshuster
Reply with quote  #5 
Link: Again, you are on top of it. Thats the combination I use: .247" for Lapua brass and .244" for Winchester, Lake City, and "other". I actually have several other sizes, a few thousandths smaller & larger, but seldom use them. I think the only way you would get a smaller chamber neck dia. than "standard" is if it's specified when the chambering reamer is cut, otherwise it will be .256"/.257". With the neck bushing die, and the proper sized bushing you will be able to control the minimum as sized diameter, ( a standard die will radically oversize/squeeze-down) and the big advantage remains in not having to use the inside neck expander. But, with a saami spec chamber neck dia., the necks will still be expanded to the .256"/.257" diameter., so you will be "working" the brass approx. .010".: .257" to .247". With a tight, no-turn neck dia. of .253"/ .252" the brass will be worked around .005"/.006". And that's the main reason I specify a tight,no-turn neck on my chambering reamers.
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