Well, if anyone actually would know how to shoot it, it would impress me. I have Small idea how but not mastered it.
ASP is a weapon that fire 12.7 round subsonic. It does not make that famous crack when the bullet goes past You. This gives the bullet a huge arc and hitting with it is more than impressive.
I've always found that this is the hardest gun to shoot, ranging is very tricky due to the bullet dropping off early (subsonic rounds do this in order to cancel out the crack)