Best bet is just contact:
kevin@weaverrifles.com.
He's made a few of these cal's on CZ's, don't know about others.
But, he'd know where to start and would get it done long before you could
get it working right doing it yourself. Ask me how I know!!
THe one I sent you is MY OWN one time chamber cut. IT's different than the other guys that have them here. Weaver made Foxhunters, and there's others too. I'd say that reamer he has is "more standard" size and should be used. Mine was cut too deep by an 1/8". IT's fine, but, other info is just a starting point. Save yourself the battle and money, not to mention the hassles of striking out on your own like I did.