I have and have had a lot of varmint caliber rifles. My best friend and school buddy from my hometown started getting rid of his guns (pressure from liberal wifey, I think) and he gave me his Marlin 57M .22 Magnum rifle that he used way back then when we went "chuck" hunting. I was with him the day he bought it in 1962.
I've cleaned it up and it still has the Marlin "Micro-Vue" 4x scope on it. My son used it this past summer for chucks. Nice rifle and it's a "keeper" for my Marlin collection.
The .22 Magnum is a good cartridge. I know-a box of .22 Magnum ammo is between $11.00 and $13.00 but so is .17HMR ammo and the heavier .22 Magnum bullet is more dependable under breezy conditions.