+1 on the Federal loads even using the Hydro Shoks as well. The 45acp is a bit on the weak side power wise, but will take one with a well placed shot. Try to limit the range to 25yds or so, and place your shots in the area between the eye and ear, and you should be fine. On the bigger boars their shield will soak up that 45 like a sponge will water, been there done that. AS mentioned don't try for the biggest. ALso the elevated position is good too. It will not only keep you from getting turned on, but also give a possible exit hole a lower position to allow for a trail if needed.
Good luck with your endevers, and you might also look into a cross bow as well. They are very productive for hogs from what I gather.