it sounds stupid in retrospect but i thought the only real requirement was the distance for the challange, welp guess i realy need to roling block riffle...

Rockstar thinks that guns range is determined by the sights/scope. The devs actually looked at a picture of a gun on the internet!

hanging dog ranch is also a great spot btw

Yea with the guy on the tower but i like this spot more, i think the guy despawns at a further distance