cowboy action shooters do all the time -and bust balloons at fulll speed.
but they use blanks and the ranges is close. and they have ear plugs for the horses..
Most of the shooters I ran with didn't use earplugs for the horses. They just trained them.
A few of us used to get together and shoot live ammo... Better be an excellent horseman, and marksman.
Mostly we shot holes in prickly pear cactus as we ran by. You can be pretty accurate.
