Nitro 3.5" #7's will probably get you to 60 yards, and maybe a bit further depending on how your gun likes it.
Hevi-13 3.5" #7's from last years lot #'s were able to achieve 60 yard killing patterns with a few different setups.
I highly doubt you will get 60+ yards killing patterns with any of the 3" Hevi-13 or other popular heavier than lead loads.......if you do you are really doing something right.
You should polish your barrel no matter what you choose.