I was on a driven Boar shoot in Hungary not so long ago with a group put together by Sika98 and one of the guys along the line from me was in a prime position. The Boar were coming down off the hill and seeing us turned across in his direction at about a good 150 yards and he just bowled them over like skittles.
It wasn't until after we'd finished the hunt that I found out that he was using a .243 with 100gn soft points as he didn't have anything bigger !!
From a static position in a high seat I have seen, only on one occasion tho, a German friend shoot a nice 80Kg boar stone dead with a .222 using 55gn bullets he had intended using for Roe but decided to pop over and visit me for a cup of coffee instead.