I've heard Hornady V-Max's really puff those kinds of hooters up, well puffs them up right before they explode that is. I wouldn't know of course, just what I have heard is all.
Those things are devastating on game birds like pheasants, chukkars and huns.
We used to have a pair on our farm (didn't live there, had grain bins, machine shed, etc). Never had a problem w/ mice/gophers. Found them both shot dead.
Cool pic, brings back memories. They used to be perched at the same place on our old barn.