Am having a frustrating but fun time with the .17 CZ. It's a new Varmint with 21" barrel and a Rimfire Magic trigger kit. Bedding is snug and scope well secured and a known quantity. Am still amused by the dinky little rounds, but frustrated that I can't get it to group nicely at 100 yds. I've read that they are fussy about ammunition and that I should try all available brands to find one that it likes.
So far, I have used:
Remington 17 gns - relatively clean burning and 4" groups.
Winchester 17 gns - very sooty residue in barrel and 5" groups.
I have before me on the desk unopened:
Hornady 'Magnum' 20 Gns
Hornady 'Varmint Express' 17 gns
CCI 'TNT' 17 gns
My barrel cleaning regime was 5 rounds from new, cleaned, then another 5 and cleaned, then cleaned every 20 rounds.
Is there a shortcut to finding what works or do I have to resign myself to simply shooting my way through the brands?