I think I've found a good spot if anyone ever wants to rack up a high bounty on themselves.
In Blackwater, look for a hotel called "Althewaye Inn". There is a photographers a few buildings down from it, it looks like a wooden shack with "Photographers" painted on it. Climb up the side of it, jump over to the next building and, finally, climb onto the roof of the Althewaye Inn. It has a big roof with a 360 view of the area, a blindspot in the center to regen health easily and 2 signs that can be used as cover. The police and civilians can't reach you up there unless you let them shoot you. I managed to rack up my highest bounty from that spot.
With a posse, the bounty would get very high in no time.
A weird thing happened in SP and I don't know what it was all about. It seemed like a random event but at the same time, it didn't.
On the cliffs that over looks the San Luis River, south of Mescalero (in Henning's Stead), a guy in a suit and top hat was standing at the edge, not doing anything. I went over to him and he said "I've been waiting for you." and "I know who you are, Marston." and I can't remember the exact 3rd phrase but I think it was "You haven't changed.".
I couldn't interact with him at all and I didn't want to risk killing him incase it screws up something later on. He didn't have a blip on the minimap, either.
It was just weird. He had randomly turned up and I was never instructed to talk to him but he seemed to sound like he was an important character.
Kalyx, if you're still looking for rabbits, I see tons of them near the horse trails between Armadillo and the McFarlane ranch in the early morning. It's easier to spot them if you don't storm along and just trot by.