Something like this.For the Jacks... you gotta be quiet, and I mean Reeeeeeal quiet (with those big ol' tall ears) as you creep thru the terrain. You'll likely spook them at first, and you'll see them run off. And Jacks seem to always run a pretty good ways away before they chillout again. (Unless they are already in thick stuff) And they will remember where they last saw you before they ran, so you'll need to engineer your creep up on them so you utilize the brush to hide your approach from view, and also the wind direction so your scent doesn't blow to them, and come in from an angle that's not straight in from where they last saw you.
Just walk around the desert or foothills and shoot em in the head when they bound up and run. No need to over complicate it much beyond that.