Barry-I think a so heavy arrow is a must with big boars,this one was a small young boy but some 400-500 #er can be around and they are not pigs,these are always been wild and tame the low(-20C)with 3" of fat and heavy furry skins.
One time a friend, with a compuond bow 70# and a 3 BL NAP,shot a 500#Boar quartering away,20 yards,the arrow entred completely but just between the skin and the rib cage.He was lucky that the boar was on a icy slope and wasn't able to run away since it was slipping on the frozen ground.He was able to make 2 more shots and then
followed the blood trail for the final 4th shot!