Ballistically spheres do not do well and right around the speed of sound they especially do not work well. A #4 lead pellet starting at 1325 feet/sec. gets to 40 yards in approximately .126 sec. with a retained velocity of about 749 feet a second. That same pellet starting at 1200 feet/sec. gets to 40 yards in about .135 seconds with a retained velocity of about 708 feet/sec.. So at the start there is about 125 feet/sec. difference but it has dwindled to less than half that at 40 yards. The .01 sec time difference would get you about .9 feet less lead on a 60 mph bird. To my mind the extra abuse of the higher velocity doesn't really buy you much.
C.G.B.
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