Debating on getting a Pro40 dually but not sure on the poundage to get just wondering if I get a 50lb max bow (don't need that much weight due to draw length) how much off from the stated IBO would the bow shoot, i.e. 30" 70lbs 350gr = 332fps does 30" 50lbs 250gr = 315fps

Btw, I love my 30.5" draw length