Next up a .223 sabot fired from a long long long way from a 0.5 BMG caliber rifle.
I've got a .308 that will do that to 1000 yd. Sighted in the new scope today for the coyotes - BTW dont forget to put your earplugs back in - I'm still deaf & nursing a headache.
If someone made a custom .50 shooting subcalibre ammo, it would do 1500 - 2000 yd easy.
Carlos Hathcock did 2500 yd with a stock M2 .50 in Nam.