Looking for advice on 3rd-2nd century BC helmets

[tiberius aemilius naso]

Italian Samno-Attic helmets, while not being associated with Roman panoply, date, the last ones, to the 4th c BC. So i wouldn't say they are appropriate for a 3rd and 2nd c BC depiction. If you want to go for a different helmet than a Montefortino, what could you choose? Based in acheological finds, Apulo-Corinthians, that have extensively been used as the helmet of the triarii (who knows why) date to the 4th c BC, so they could be a relic in a Second Punic War scenario (but recently there have been some "rumors" that some have been found in a shipwreck dating to the First punic War... time will tell). If you are portraying an officer, you could maybe choose a hellenistic attic helmet.