I have been on a project needing now a 7.62 tokarev die for rolling block that has a .342 neck rather than the .330 neck (or thereabouts) it has now.
Everything else on the die is perfect. 

It doesn't have a pilot hole such that I can use a rougher directly to open the neck to 8mm. If I try to anneal (which will be successful) I need to have a simple method to open that neck to my desired diameter. I really don't want to lathe bore to get the dimension, I don't like little DEEP holes and that is a LITTLE DEEP hole. I suppose that is the answer. If I ran a chucking reamer in, there is not axis to follow critically. It IS an easy job for a chucking decimal reamer though. 

Re-heat treat is not a problem.

Anyone tried anything like this and if so, what humps did you run into in the process??

IM after a pearl of wisdom.

I suppose if someone has a sunnen hone Id be willing to pay a proper operator to open the neck for me as if they have the home, they likely know what they are doing!! Bubba likely does NOT have a Sunnen hone in the shop to "bubba" a die!

Thanks in advance
Mike

I'll try the aluminum. I only need to size the neck and push shoulder back .001. No body work.
If that does the trick, maybe I'll repeat on 12L14 and then case harden it if it seems like it will wear.

Neck on TOK is .330 from FL sizer. I need it opened to .344. I can't lap .014 out of the neck in the die. Needs to fit a .327 bullet in a .010 neck wall. 
That's the wisdom I was looking for. thank you rgchristensen

If you're doing a little machining, what about making just a neck sizing bushing with an OD to fit something like a Lee universal expander body. You may be able to keep your cases a bit straighter. You may not need to or want to touch the shoulder on every sizing, maybe your full length sizer doesn't have to touch the neck and just bump the shoulder if ever wanted. Some folks prefer to expand up for the tension they want, so it may not be necessary to hit a precise neck sizing amount. If I wanted a combo full length sizer with a fixed all in one neck size, I'd think I would prefer it very accurately machined. Best of luck with it.

I think I would make a chamber cast & send it to Dave atvCH4D.  Ask if he has something off the shelf that will let you form close inough to fire form.  After FF use neck sizers . May be you are close enough already for neck sizing.  Neck sizers are all that’s needed for most work. You could get a basic neck size body from CH and make your own Aluminum bushings like Chris recommended.  Or size with a bushing in a arbor press. 

Boats

Clarification to several.
8mm is 8mm bullets- .323 plus plus as needed for throat fit
32 cal is .314 as in 32 colt, s&w, h&r

I already have brass formed. Rather, I need to neck size after firing and eventually set shoulder back. Hence the need for an odd duck die(s).

Ch4d has been called and discussed at length.
I have no options but custom with them.

Looking for simple and cheap, which is what wildcat development has been done for years with, nobody wildcats, draws a cartridge, orders $400 in dies, then shoots the round to find out it fails to perform. 
Therefore a Rube Goldberg directive, too many dies and odd duck garbage,  must ensue as those are usually cheap, free or at the cost of R.E.M. whining at home.

I belong the original answer, "I've annealed dies and changed them" was the reply I was hoping someone would offer. Wanted a bit of confidence before I make a die butter soft again and destroy it. 

I'll anneal and machine the neck best I can and hope it will suffice for the need of load development. 

The varied replies from everyone has given me the what I need to run!

Thank you to all!

Try your seater die for the correct neck diameter.

When making sizing dies please take into account brass spring back. Don't ask how I know this. This should be easy to determine using an existing die of approx. the same diameter and sizing down a case in it. When case is removed measure size of die and size of brass and compare. That will show you the amount of spring back to expect.

texasmac wrote on Mar 29^th, 2018 at 11:26pm: