If you're interested in historical epics or action films, "300" is definitely a notable movie. Enjoy your watch!
Here's what I found:
The movie "300" was indeed dubbed in Tamil and is available under the title "300: தெர்மோபைலே போர்" (which translates to "300: The Battle of Thermopylae").
"300" received mixed reviews from critics but was a commercial success. It was praised for its visuals and action sequences but criticized for its historical inaccuracies and depiction of the Persian Empire.