i would just go get a 7mm rem mag they are in my opinion one of the most versitile hunting rounds you can shoot. if you reload you can go anywhere from a 120gr all the way past 200gr. i use mine for everything from coyotes(explosive) all the way up to elk(i would say moose but i havnt got a chance yet) in my opinion you shouldnt get a 300 since you already have so many 30 cals but thats just me talkin