Time for one short point today. Balance (teeter-totter point/Center of Gravity) can be related (measured to) any other point in the universe. However, the most relevant point is distance from the front trigger. Since the (front) trigger dictates back hand placement, measuring CG to trigger and center of each hand's placement to trigger allows a quick and easy calculation of % of gun's weight in each hand. Some shooters are surprisingly sensitive to this factor. Example: CG to trigger = 4", Trigger to back hand = 6", and trigger to center of front hand = 9". Hand spread = 15". Back (trigger) hand % weight is calculated from 9" / 15" = 0.6 = 60%. Front hand distance divided by over all hand-to-hand is correct for the rear hand (the closer the hand center to the gun CG the higher % of weight it holds). So, front hand has 6"/15" = 0.4 = 40% = 100% - 60% . For a 6 1/2# game gun the back hand holds 0.6 X 6 1/2# = 3.9# (3# 14.4 oz) and the front hand holds 0.4 X 6 = 2.6# (2.6# = 2# 9.6 oz).

The difference in weight per hand is linear as the CG and/or hand placements change. The change in MOI is a square function (1X1 = 1, 2X2 = 4, 3X3 = 9, etc.) of mass X radius about/around the CG of the mass (lowest possible) any other defined point. Lengthening the radius by 3 has an effect of 9 times on the MOI.

Pivot pin has been the go-to location for "balance" for a long time. The truth is that there is so much variation among guns for trigger to pivot pin length that it simply is not a useful measurement.

DDA