Actually I just found out there is a way to measure felt recoil. Load force makes a system that connects to your PC and to a pressure switch on a block between your shoulder and the gunstock and will calculate the recoil when you fire, it's called Loadforce-250. All this for only $499.00 and you to can find out why a 3 1/2" mag w/heavi-shot kicks the crap out of you.