Small (mid) frame. It IS "just" a variation of a New Vaquero and says so on the frame and not "Montado." Montado is just a marketing name for an otherwise regular NV with special features of shorter barrel and SBH profile hammer (with its own distinctive cross hatch)--and in stainless only. Early examples had a unique/distinctive anti-slip serrated frontstrap (gripframe) marketed for mounted shooters. Some CAS/SASS rules don't allow such a "modification" and so out of broader-based marketing/sales expediency, Ruger dropped the feature.
It is durable--very.
Limitations? No, not really.
Only practical limitation is your comfort. Shoot 180 Buffalo Bores and you'll feel it. Over time, so will the gun I imagine, premature wear from abuse just as with about any revolver.it. Will it likely wear out before the large frame (original) Vaquero or Blackhawk? Probably, but you're talking many (many) miles down the road.
Again, main limitation for most people would be you, your comfort - as in shooting "super heavy" loads, and of course--speculation--ultimately that'd also trsnslate down the line to premature wear if shot a lot/predominately that way..
Actually, in 357 chambering especially what strikes you is, with all those "little" holes making for a lot of metal, is what a little tank it is.
It is what it is. Short barrel = increased muzzle flip especially noticed of course with hot loads.
Great gun, go for it.
