For 200 yards and under the 450 bushmaster is going to be a great choice. The 6.5 is a good round and cheaper to load for but IMHO is better suited to longer distances. For hunting where you're not going through a lot of ammo; 450 would be my choice.
EDIT: Just an FYI if you plan on loading your own 450 BM rounds one of the nice things is that with a Lee bullet sizer you can resize 458 bullets to 452 giving you much greater bullet options (from like 140gr to 600 gr). I 140 gr in the 450 GM would give you something like 2500 fps and extend your range if you so desired.
EDIT: Just an FYI if you plan on loading your own 450 BM rounds one of the nice things is that with a Lee bullet sizer you can resize 458 bullets to 452 giving you much greater bullet options (from like 140gr to 600 gr). I 140 gr in the 450 GM would give you something like 2500 fps and extend your range if you so desired.
