Both will kill large NA game at the distances proscribed by the OP. Dead is dead. The 300 norma doesn’t make them “too dead” anymore than the 6.5 creed makes them “not dead enough.” Splitting the difference is unnecessary, but will help some gun maker take money out of the OPs wallet.
I see your reply and raise with;
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Edit. I just saw that you’re the OP. Go forth and spend your money. There are a dozen cartridges and at least as many rifle configs between your two rifles. Go nuts. Each one will be slightly better, and slightly worse than the next. You’ll not know the “best” until you sample 2/3 of all possible configurations. Once you have done that, settle on the next rifle/cartridge that meets your specs. That, mathematically, is the best option.
The internet is a funny thing. You create a thread, but you have no say in who posts or what they write.