i've had the 58 cal ML double for several years, mine is so old that it has a 3 digit serial # and was regulated with one rear sight. The newer ones have 2 rear sights so you sight one for each barrel. mine regulated with 144 gr of pyrodex and a 330 gr REAL conical bullet. With that load its great. A guy at work bought the 9.3x74 a bit ago and couldn't get to shoot decent no matter what he did. he finally sold it. For the costs involved today I wouldn't really look to seriously at them. there's only a little more involved to find a decent 9.3x74R