6.5 Creedmoor

The 6.5mm Creedmoor caliber with 140-grain ammunition from both Hornady and Desert Tech and shot with a Desert Tech MDRX rifle (20 inch barrel), achieved groups averaging half to sub MOA (0.5-1 MOA). The cartridge stays supersonic and maintains its accuracy to past 1,200 yd (1,097 m), while the.

https://en.wikipedia.org/wiki/6.5mm_Creedmoor