Bronko,

Some cowboy action clubs won't let you use the 44mag cartridge for their shoots. 44special, 45lc, 44-40 those are okay by their standards. I'd check with the club your going to shoot at before buying the pistol.
The vaquero is a really nice pistol. I own three in the 45lc and all shoot really well. Have fun, cowboy action shooting is really a good time.