I used a Bushnell "Trophy" scope mounted to the reciever of my Mossberg 500 combo which never comes off. Smooth barrel for rabbit and non-flying Grouse, and rifled barrel for deer where rifle hunting is not permitted. Canadian regs mandate that steel be used for all waterfoul hunting, so I can technically use lead for Rabbit. Since I reload my own ammo, I find it easier to stick to one or the other for this purpose. It eliminates confusion. The only lead I reload is Buckshot for brush hunting and home defence.