30-06 has probably slayed more moose in Alaska than any other caiber.
+1.
I will bet the '06 has killed more bears too.
^^^^^^^^^^^^ is your answer. Even if it may not be what you want to hear,
Mike McDonald, retired chief biologist for ADF&G, once told me that more brown and grizzly bears were killed in defense of life & property (DLP) with a .30-06 and 180gr cup & core bullets than any other combo. This was based on the necropsies and reports that have to be filed with ADF&G on every DLP case.
If the OP is comfortable with a .300WM, I say go forth, buy a stainless/synthetic .300WM, put a good 3-9x on it, load it with premium 180gr bullets and go kill stuff. My surrogate Dad killed several Interior Grizzlies, and I don't know how many moose, with his Colt-Sauer .300WM and dropped them all without issue.
Ed