Probably not the best test for a mounted slinger. Mechanical bulls are designed to mimic the bull bucking not walking or running. If my horse started doing those types of manuevers slinging would be the last thing on my mind. First thing would try and get the horse under control.
Lol,just tried slinging from a mechanical steer(lowest setting)and..well,I now have a fist sized bruise on my right shin
when I finally managed to follow the motions of the apparatus I actually managed to sling two stones(didn´t have a specific target,just wanted to see if I could sling)
my conclusions:
overhand is extremely difficult,and so is the underhand throw.
Got most success when I angled the sling from a helicopter throw.(something between underhand/helicopter)
If anyone of you want to try this use tennis balls.seriously.a sling loaded with a stone at full momentum hitting your shin is unbelievably painful.
I actually thought my leg was broken,but fortunately it was just my pride that got shattered