I need to eliminate some whitetails on our farm. I am outside working on tractors or with machinery all day so I don't want to tote a rifle with me at all times. I have a 10mm and figured that with fast and heavy ammo a whitetail would go down pretty easily. I had three 25 yard or less opportunities today. I have some 180 grain gold dot ammo, rated at about 1200fps, would this be sufficient?