I'll play! My favorite rimfire cartridge is the 17HM2. It's what got me back into the rimfire game, as well as took my love for squirrel hunting to a whole new level.
I have three CZ 452s chambered for it - with some plans to convert a couple other 452 22s (that weren't originally chambered for the round) into it as well. The three CZs I have in 17HM2: 452 Varmint, 452 American, and a 452 Maple American.
I'm a huge fan of the 452 lineup, with multiple models in each caliber that they released. With that said, the Zephyr IIs are starting to creep to the very top of my list of 'favorite' rimfire platform. They are OUTSTANDING rifles. In fit, finish, and function. I'm amazed at how exceptional the Steyr rifles are. I wish I could get two more Zephyr IIs in 17HM2, but I've been told the 22LR to 17HM2 conversion is far from ideal with the barrel being pinned to the action.
Then there are the Henry .22s.. they never cease to bring a smile to your face.
I love centerfire cartridges and the hobby of reloading - especially the smaller varmint based rounds - but rimfires are my real passion.
I'd love to get into a 17WSM eventually - I started buying ammo when I found it on sale for the day that finally happens. Anyone have a suggestion on route to go for one of the 17WSMs???
CZ 452 Maple American
Steyr Zephyr IIs - Top to bottom (a threaded version and FS version in each caliber): (2) 22 WMRs, (2)17HMRs, then (2) 22LRs! (Still trying to settle on the scope situation after trying a couple options.)