I would think a good .357, .41, .44mag revolver would be IDEAL for your uses. It's what I would (AND DID) choose myself, except having free run on 120,000 acres would be a dream to me. If you're absolutely dead set on an .22LR, go with a mk2 or mk3 Ruger semi-auto. The .22 magnum when shot out of Ruger Single Six, especially with at least 6.5" barrel, SHOULD do just about anything you need. Need any help patrolling all that acreage????