Once you establish the numbers you either shoot well or enjoy shooting (these are not necessarily the same thing), you can "know from afar" if you will like a gun or not; just as you know if a stock can be made to fit you from hearing/reading the LOP. Also, you can nearly replicate a gun - think making a "pair" when the time and place of manufacture are widely separated. Not knowing these numbers for yourself is to handling like not having your stock dimensions is to fit.
A gun with swing effort of 1.0 takes half as much effort to swing as one with a swing effort of 2.0.
