Interesting, 2 types:
Double-(or more)-stacked bullets so you get multiple rifle-spun projectiles per shot
Buckshot-in-a-bullet containers
“Achieved a 92 percent success rate against drones”.A pretty good success rate because, drones with munitions are a terrifying thought. 
I guess, my first question is, what size drones are we trying to take out? Full size Reaper drones spying on you, or your neighbor sending his personal drone over your yard, to spy on your wife nude sunbathing?
Another option, for a smaller drone, might be Snake Shot type pistol or rifle rounds.
Just in time for spring turkey season!
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The photo shows, 5.56, 7.62 and I think, .50 cal which is effective to 2000 yards=6000 ft. That’s with ball ammunition though.