Yep, got lots of experience. Had 3 or 4 at one time and had them made by both arsenals. Had one, at least, made by Beretta and some of the others made by the Tierni plant (arsenal). First got involved while working for a private firm that subcontracted for the Warren Commission and had access to all models of the rifle and tons of different types of ammo.
Bore dependent, the rifles are good shooters and can be very accurate. I reloaded for the 6.5x52mm Carcano with both 140 and 160 gn slugs and found the cartridge to be harder hitting than expected and quite accurate. I have felt, for a couple of decades, that a modern day version of teh 6.5 Carcano would simply be a excellent choice for most anything in the lower 48. Just about anything the 6.5 Swede or 260 can handle would be fodder for the Carcano cartrdige and I am going to opine that at this point, the 6.5x52mm is a reloaders proposition.
As for the Mannlichter Carcano rifle itself - more than adequate for the 6.5mm cartridge. The action is a split bridge Mauser design or variation that uses a internal clip fed feed system that drops the stripper clip out the bottom of the action when its empty. The bolt wears two lugs and the action is strong enough for the 8x57mm round. The finishes on many of these rifles is a or appears to be a baked on paint of sorts that really makes it look junquie, so to speak, but don't let it fool you, the metal is good, it's just the paint job that looks crappy. I have seen them stripped of paint and blued and they look decent. Sights are typical Mauser sights. The rifles come in three calibers: 6.5x52mm, 7.35 Italian (Tierni) and 8x57mm - pretty rare. Of the lot, I would opt for the 6.5mm bore and reload. HTH.