I have no idea what i am shooting. Is it a good thing to know or is it not a big deal? Also, what is the grain talk? I am shooting 100 grain broadheads? is that to light? If i was shooting 70lb draw and like 300 grain arrows would that be able to blow out the shoulder blade? Im lost on this stuff. When you said you are shooting 392 grain is that just your field points? Or the entire arrow and all?