Would you all explain polygonal rifling to me? What does a cross section of the bore look like? Are all the sharp angles eliminated at the edges of the lands and the juntion of the lands and grooves? Or is it a geometry shape like a pentagon, hexagon, or....? How does a polygonal barrel compare to a Mike Rock 5R in performance? When it is time for me to rebarrel should I go with a Pac Nor instead of another Mike Rock? Do polygonal barrels generally do well with Barnes X bullets? Please have patience with this FNG. Thanks for any help and sorry to take up so much of everyone's time.