I have only seen/handled a few Kibler Colonials with standard and fancy stocks. Add my own, a fancy(grade 2), it was difficult to discern all that much of a difference. I think Jim tries for a good degree of attractiveness and figure regardless of the grade, along with the difficulty to fully judge an unfinished blank. IMO, the method of finishing the stock can also effect the final appearance.
As to weight, I have both a 50 cal and 58 cal barrels for my Colonial. The 50 cal weighs 9.2 pounds, the 58 cal, 8.6 pounds. While only a half a pound difference, for my medium stature, the 58 feels “perfectly” balanced, the 50 cal is front heavy, and difficult to for me to hold steady for much more then 10 seconds for off-hand shooting. I will say that both barrels(GM-straight cut) are exceptionally accurate!