The Encore might not meet your requirement, out of the box, accuracy at 500 yards. I have worked on several Encores for shooters and have two friends that have a similar setup as that you describe. With factory ammo and the centerfire rifle barrels, they get 3 - 4 inch groups at 100. With reloads they get about 1.5 - 2 inch groups. The owners have been pretty disapointed with the idea VS their actual results.
I would advise that you talk to some folks that own an Encore rifle before you dive off into the deep end. You might be better off with two guns in the long run.
Ed
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