I think you are well equipped with what you have. At least where moose are concerned. The Whelen is as good as it gets. The 7 Mag is every bit the elk gun as the 300. Just my take on it. I have used the 280 for both critters and never had one not go down. There is nothing wrong with the 300 Win Mag. I would prefer it by far to the 7 MM Mag. However if you have the 7 Mag and you like it then it will do about anything the 300 will do.