IMO in guns for SA, break action gun are better, as they don't suffer as much as autos from dirty cartridges.
They stop ejecting, but still work smile
I would use a current production gun, Argentina is no place for vintage guns.
I've used Berettas and Perazzi, both without problems.
Berettas are great, as most lodges have spares and knowledge to do some repair on them if needed.
I use a chamber brush in the field if cartridges are too dirty.