RE: Would you consider it overkill?
Wouldn't overkill be MUCH better than underkill?
My point is, it shouldn't be considered OVERKILL if it is helping to down game more quickly. Sure you could cleanly down game with less, but everything extra has to help...not hurt.
I kind of have the feeling you are relating this to the Rage thread....
To answer your question though, sure I could kill deer with less, but I'm using what I'm using because I think it gives me more of an advantage and I'm comfortable with it.