For hunting whitetails in open country, nothing beats a .338-378 WBY. A great combination of knock-down power, and flat trajectory.
For 'bush' hunting, I'd personally go with a .458 Win Mag and 900g solids, since they will shoot right through a tree, and still kill a deer standing behind it.
Pick up some 5" magnum shotshells (for your 10 gauge) loaded with #4 Buck (steel) and you're good to go for ducks and grouse, too.
Seriously, good deer guns start with the 6mm's and peak around the 7mm-08 and .270 Winchester. Nothing wrong with a .308 or .30-06 either.
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