Re: cutting a chamber to match brass dimensions
http://www.6mmbr.com/warnerdie.html
The link above is excellent to see the whole system.
One of the big thing is you can use with more than one cal. You have ti remove the large nut on a RCBS press to accept the die.
"The complete WTC Die with one body insert and one neck-shoulder bushing is $325.00. This includes the headspace shims, allen wrench (for the shim holder) and a machined wrench for the lock ring. Additional caliber-specific body inserts are $100, while neck-shoulder bushings cost $50.00 each.
So, with a complete die and two (2) neck-shoulder bushings, you would have $375.00 invested in the die ($325 + $50). That sounds expensive, but consider this. You can use the die for more than one cartridge. All you need is another body-sizing insert ($100.00) and appropriate neck-shoulder bushings. If you load different cartridges that share the same shoulder angle and neck size (such as the 6mmBR and 6-6.5x47), you can use the same neck-shoulder bushings on both cases. The WTC Die body, made of 4140 steel, pre-heat treated and blued, will accept die inserts for any caliber from 6mm to 30-06.
Realistically, though, you'll probably want a new body insert and at least two neck-shoulder bushings for each cartridge you reload. That totals up to $200.00 ($100.00 for the lower "body" insert plus $100 for two neck-shoulder bushings, priced at $50 each)."
