I like to use duller broadheads to help the arrow stay in the bird.
Makes no sense! I want my blades to cut anything they touch and if they go all the way through, nothing worng with that. Buta head that is dull, isn't going to do the damage that a sharp one will!
I also have done like Roskoe does, I have slightly rounded the tip on my jackhammers, but keep the sharp blades!