Wear a ghillie suit and start the party from half a mile away with subsonic ammo and a suppressor. .45-70 comes to mind.
Ya, that is a hell of a long range rifle.
Something like it was good enough for Billy Dixon. .50-90 as I recall. His shot at a leader of violent savages was a very few yards short of 1 mile. No, he wasn’t using a scope.
You wanna hold my beer?
I'm not a participant, but don't them BP Cartridge fellers shoots at Buffler silhouettes at 800 or so yards? close enough to 1/2 mile?
I figger a man can hit a buffler at 800 yds, a gaggle of them protesters be just about the same size. Even if you were off a bit, like hit the buffler in the butt, you could likely take down a coupla them targets anyway.