"Properly" ....now a days C903......properly can be many things ......poundage is up.....arrow weights down......vibration dampining products....all time high !!

How many people do you know shooting a 60# bow and 540 grain arrows ? I know zero !

I have seen more like a 8-10 fps difference on the hunting set ups I've seen.........which fall in between AMO and IBO !!