Jeff,
The July/August 2006 edition of Shooting Sportsman had an article on theoretical MOI. From what I've read the formula is pretty accurate when compared to the actual machine. The formula is:
Min. MOI = .34(wt in #)+.07(COG)+.12(LOP")-.06(Ga.")+.04(barrel")-.03(1 for sidelock or 0 for boxlock)+.04(1 for single bbl or 0 for double bbl)-4.05
COG = balance point in inches in front of the (forward)trigger.
" = inches
Guns with the following values are described as:
1.2 - "lively"
<1 - quite quick
>3 - heavy e.g. a fowler
My SAC calculates to 1.5, my Field Grade Elsie is 1.74, my 28ga Bobwhite is .94
If nothing else it provides a relative reference for those on the geeky side. :-)
