Sounds like fun to me, but why only autoloaders?
Bullfrog,
Rimfire silhouette shooters use metallic targets cut to look like animals, in different sizes for four different distances. One shoots offhand and tries to knock them down. Ten shots at each size in five round strings. A perfect score would be 40, and not many have ever done it. It's super practice for hunting.
Chickens at 40 meters.
Javelina (pig) at 60 meters.
Turkey at 77 meters.
Rams at 100 meters.
The sport originated in Mexico, with centerfire rifles at much longer distances than those quoted above, and was originally shot using live animals. Down there they call it siluetas metallicas.
Rimfire and handgun silhouette shooting came later.