x30 not being suitable for hunting is very subjective Onepoint. I imagine out in WY, you would be correct as you probably have fairly long distances you shoot from. Here in most of MO and many other parts of the country, Hunting with something in x39 is very handy and plenty accurate. We don't often get shots past 100yds due to wooded areas, etc. My SIL has 80 acres in central MO and about 70 of it is heavily wooded so he rarely even gets to the 100yd mark. (50yds is probably average)
X39 and 30-30 are used quit a bit around here for deer and feral hogs as well as Coyotes. To hunt with a caliber much larger than that means losing meat due to excess exit wound. My first hunt in MO back in the day was with a Mosin using 208gr Brown Bear SP at about 35yds and I lost the entire right front shoulder/leg because the caliber was just too much. Switched to x39 after that and have never been disappointed.