Not 800. Why 13" groups at 800? I'm sure you can do better with some adjustments. Not bashing you or shooting but 1.5+MOA isnt something you have to live with nowadays. A lot of factory guns and premium ammo can do better. I like to be able to do better than that before I pull a trigger. I would figure out what I had to do to bring that down to at least 1MOA and then shoot 800. The bullet has the ooomph, it just needs to hit the spot. Missing an aiming point on a deer by 6.5" is too much. 6.5 can turn into 18 real quick.
Not bashing you at all I just know that you can do better. That would be a better thought than if its good to 800. Is your gun 1.5 MOA at all ranges or just waaay out there?
A pretty well respected gun writer once said "Only accurrate rifles are interesting".