The standard 6.5-284 neck is .300, and would be properly established by the expander ball exiting the stock case. I have no idea what the die would size the neck to MINUS the expander ball. I'm looking for a .290-.291 loaded round and neck walls of .0135 or so. I don't fully follow what you are suggesting.
ba
Yep, ex bullet maker.......for the moment.
Bryan,
One plan: Dunno if Carstensen is still making a bushing die from a "regular" die for $35. If so, you could start with a plain old .284 FL like the Lee & have him make a bushing die from it.
(An aside: I'm surprised the "standard" neck for a 6.5/284 is .300. That (.300) minus .264 is .036. Divide by 2, = .018. Unlikely the case walls are anywhere near that thick... That's a LOT of clearance... But never mind).
Alternatively:
As long as a regular, i.e., non-bushing die, sizes the neck down enough -- say .289 in your case -- you can make up a couple mandrels to screw into your holder (you've got a mandrel holder for something, like expanding up .220 Russian to 6mm, or 6BR to .30, or something, right?)
Use the mandrel to take you up 1, or 2 or even 3 thousandths. Once you figure out what neck tension you want, size down with the "regular" die with the expander ball removed, then follow that sizing with the specific mandrel.
Yes, it is one more step in reloading. Also probably the most accurate way to get even necks. If I'm going to a big match like the 1K Nationals, I use a .001 smaller than normal bushing, then size back up using a mandrel.
I base all these suggestions on the notion that you have or have access to a lathe -- drill press might work -- and can make certain pieces, but can't make a full FL die. Most of us don't buy the extra reamer needed to make FL dies, but can make mandrels.
Same notion with a Wilson seater -- a blank is about $35 as I remember, at least for the 12L14 steel ones, and a regular chambering reamer is used to make the seater. Probably could be any suitable 6.5/284 reamer. It doesn't really have to match your chamber *precisely,* you know, though that's nice...
If Carstensen is still willing to turn "regular" dies into bushing dies, that would be simpler, of course.,