From the Miculek channel, “You’ve seen him rapidfire the beast- but this time Jerry Miculek makes an outstanding, seemingly impossible shot using a 34 pound Barrett M107 50 caliber rifle, a Vortex Razor HD gen II JM, and Hornady 750gr A-MAX ammunition.”

1000 yd Standing Barrett 50 cal Quick Scope Shot in 2 seconds
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I know someone will ask.
The bullet hit the steel below the balloon, and shrapnel from the bullet as it came apart against the steel, popped the balloon.