I have a 77/357, and its a cool little gun. They have become quite pricey now for some reason, and are going for close to $800 here. I only paid just over $500 for mine a couple of years ago.
I like the gun for the most part, and a lot better now that I lost the recoil pad and fitted a butt plate.
Mine shoots well, but seems to prefer the JHP's the best, and especially the 125 grain bullets. It doesnt seem to like LSWC's much at all.
The only trouble Ive had with the mags has been with .38's rimlocking. The .357's have been fine.
I find the bolt knob to be a tad small, but its usable.
With a scope mounted, the clearance between the scope and the bolt handle is pretty tight, and rather annoying. The bigger bolt knob would be even more of a detriment here.
I also found the bolt handle/knob interfered with the NECG peep I had tried mounting on the rear mounting point. It worked OK on the next point forward, but the sight works best on the rear most point.
I really didnt like the NECG peep. It works OK, but its pricey, and fiddly to adjust. You also cant take the aperture out to "ghost ring" it, as the aperture screws in to lock the elevation plate. Its well made, just not well thought out.
Right now, Im back to the factory irons, and seem to like it the best like that.
Ive only ever seen a couple of the Rossi's, and they were in shops. They really didnt impress me much from what i saw. I have both Winchester and Marlin lever guns, and the Winchesters are the smoothest working.
Ive had a number of .44 and .45 Trappers, and still have one in .45, and they were all great little guns. I wouldnt mind picking one up in 357 (assuming I could find one) now that Im shooting a lot more of that these days.