As far as I'm concerned, a "well-balanced" shotgun is one that has good dynamics and pointability for its intended use, whether it is an 8 1/2 lb. 12 ga. SC o/u, a 7 1/2 lb. sxs-o/u for pass shooting, or a 6 1/4 lb/ sxs-o/u for grouse, woodcock, or quail, with some crossover between these. Pretty simple, actually.
JR


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God bless America, long live the Republic.