. I've outgrown all foolishness. That's why I'm having a 338 Norma built. Way more practical.
Ya a .338 for deer is totally practical.
For what it's worth on this old thread, if you're dead set on a .300, then the WSM. If not, I'd go for a 6.5 in a short action.
Either a Mauser or a .260 rem.