.44 Mag is more than big enough. People make far too much out of caliber when it comes to pigs. A hit behind the ear and down they go. My son has taken several with a bow, .223 and a 12ga SST slug all dropped on the spot, I took one at 20 yds with a 30/06 slug right thru the shoulder and it took off like it wasn't hit. Dropped about 40yds away. The average pig you see in the woods isn't the monster we all hear about. 220 lbs would be at the large end. Are there bigger ones yes, on ranches definately but in the wild they are harder to find.