You can either use the big boy 7mm mag, or get closer to the hogs and use buckshot. Hogs have somewhat of " body armor" and you need a big, fast, heavy projectile to crush through bone. I've shot them with a .300 mag through the shoulder and when using dogs I have shot them with 00 buck. ( they are a lot faster than they look). If 150 yards is too far for you to shoot accurately you certainly don't want to be shooting behind te ear. Remember.... Aim small,miss small.
Paintings were made to look at, and guns were made to be shot. If you aren't going to use them as they are intended for, get rid of them and buy a Picasso.