Being new to the chart and from your comments, I thought that the MOI @ CG was the number used for your final quantifier, but I guess that the HWR tells it all.
I wonder what a gun would be like with a steel receiver compared to the exact same gun with an aluminum receiver?
cazman, there is no single summative number. Like a set of stock fitting dimensions of LOP, drops, casts, etc., you need weight, balance, unmounted swing, and mounted swing. HWR gives you a "picture" of where the weight is located.
As to the steel vs aluminum reciever, the aluminum reciever would tend to reduce weight, move the balance forward (most of the receiver is behind the balance point), slightly reduce both swing numbers (any weight loss other than exactly at the CG/balance point will reduce moment of inertia, increase the HWR (the remaining weight becomes more spread out after the weight loss at the receiver). I'm sure the Yildiz has a very light receiver and relatively heavy barrels and stock.
Questions??
