In the 44 mag. (and 41 mag.) the 10" barrel is standard on the silhouette class revolvers. The 357 mag comes with a 9" barrel standard on the silhouette class. You can order a 357 mag with a 10" barrel (extra cost) and it must have the wood grips (extra cost) on it to make weight (<4lbs.). Shorter barrels may also be shot, but safety concerns in the freestyle position and the shorter sight radius come into play. As to which cal. is the best for silhouette, all will do the job very well.