So, I was watching this "Extreme Marksmanship" program -- well, a part of it -- of TV a couple weeks ago and this one guy shot a golf ball off the top of a post at 25 yards, using a rifle with iron sights.
I thought, so what? And this evening I took 5 golf balls out to the range. At 50 measured yards, using iron sights on a .22 rifle, I hit one golf ball once and another three times (I didn't realize I'd hit it the first two times because it didn't move). .22 long rifle ammo, Aguila's premium, lead round nose, standard velocity.
Then I shot two more golf balls at 25 feet using a .357 magnum Ruger New Vaquero revolver. Each took three hits of jacketed hollow point Blazer ammunition.