If you don't want to wait for Jim (a good guy but he's probably busy shooting gophers
), then try one of the
"Bob Sleds" made by Bob Hahin. His single shot adapters are made out of Delrin and he'll sell and ship one to you for $42. He makes two versions for the CZ527 in 22 Hornet, 221FB, 222 Rem; the "S" version for COL= 2.265" and the other for COLs of 2.385".
Midway CZ 527 Bob Sleds are out of stock but Mr. Hahin will sell them direct if you contact him:
Bob Hahin “Original Bob Sled”
720 Ensenada Avenue
Berkeley, CA 94707
(510) 334-0738 Cell, call before 9pm PST please
rghahin <AT> juno <DOT> com