Here's a couple of rimfire alternatives. I played with some Trail Boss in my Browning 53 32-20. Definitely rabbit worthy. Groups shot at 25 yards and the rifle wears a Lyman 66 receiver sight.
I've got a beat up Savage 23 that I can use. Looks like it was an old barn gun Sub Sonic hand loads are not much louder than a 22 RF.
It's my...ahem...backyard deer rifle.
Dan