For a 500 yard gun, I dont know that you could possibly do any better than a 300 Win. Thats a walk in the park for that round.
Play with some different loads in it. You might get the groups tighter than they are already with the bbl thats on it. And, yeah, it will stop a bear for ya about as good as any.
Lots of guns will do the job you want at 500 yards. But I think you got your gun already.....
Andy
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