20ga Ithaca ultra feather lite IMO the best small game gun ever made

Depends on your style of rabbit hunting. When I was a kid we'd jump shoot them out of brush piles & I like .410s for that. Then I graduated to stalking & shooting w/ a .22 Long Rifle. The last 15+ years I've had beagles and I'll never shoot another rabbit that's not in front of my dogs. My favorite rabbit gun is a Remington 870 20 ga. youth model (shorter comb & 21" barrel). I carry Remington Express Long Range shells in both #4s & #6s depending on the cover we're hunting.

For rabbits I use my Henry lever in 22LR with 36grn. hollowpoints.

Ruger .22 pistol, a good pair of snowshoes, and a fresh snowfall, it don't get much better....

Older Savage/Anschutz .22 LR / Mueller 4.5-14x40, here in the midwest farm country most shots are well within 100 yards--

Rabbit gun
 

Usually a S&W 22 sometimes the contender 22.
Alex

Winchester Model 42 with 3" 7 and 1/2's.