i kinda thought along the lines of conventional bullets but .22 with the same high ballistic coefficient, streamlined and long a tapered back and long for-end, with a narrow waist that grips the rifling.
rather than making the tiny shuttlecock lead pellets that seem mostly hollow and spindly, rather than solid and even in weight that i had in mind
i may try some experiments
"Although personally I am quite content with existing explosives, I feel we must not stand in the path of improvement"
-Winston Churchill