I am looking to carry a pistol this summer for protection while fishing near the elk herds of the Cascades. Mommas and their young may not see or hear me until I am perceived as a thret... look out. I am thinking to scare not kill but if I have to kill I need something big and am considering a 45cal Springfield XD Tactical, or a Ruger Super Red Hawk 44 mag. Is a 40 cal enough for this kind of protection? Anyone have some suggestions?