Were there, in fact, any such lunatic actions?
If not, why not return to a scenario where basically everyone open carries?
If you look past Hollywood to the facts those big shoot outs didn't happen and what few did happen they hardly ever hit anyone.
OK Corral: Some members of the two opposing parties were initially only about 6 feet (1.8 m) apart. About 30 shots were fired in 30 seconds. Tom and Frank McLaury and Billy Clanton were killed.