For deer? I have Killed deer with either a 300 wby or 300 wm with 180 gr HDY SPs, Sierra GKs, Nosler BTs, and Nosler Parts! and one with a Barns X bullet.
Love the 300s for deer (my favorite cartridge) to hunt deer with. Do you need it no but i like em!
None have gone far, and I would rather a soft fast opening bullet for thin skin game to be quite honest. Experienced to opposite a few years back with a 7mm RUM and a X bullet passed though lung shot and the deer ran like he was not hit, penciled? for some dammed reason, like an arrow. I retrieved to deer with a decent blood trail, and the bullet seemed to work as it was intended, but it did not seem to transfer the energy (shock) to the animal! Like I have seen with the soft bullets, and with these soft bullts on deer sized game i have seen some very dramatic quick kills!
Been Temped to try a SMK bullet out of my 300 sendaro to see what it would do in the boiler area? I am sure it to would down the deer. Thin ribs and at most 1 1/2 feet thick through, it dont take much to do what you need.
Of course I would only try this on a very controlled shot!