In a mixing bowl, combine the chopped salami, capicola, provolone cheese, shredded romaine lettuce, diced tomato, sliced pepperoncini, and chopped red onion.

In a separate small bowl, whisk together the olive oil, red wine vinegar, Italian seasoning, salt, and black pepper to create the dressing.

Pour the dressing over the meat and vegetable mixture and toss until well combined.

Slice the Italian bread horizontally and layer the filling evenly on the bottom half.

Top with the other half of the bread and press down gently.

Cut the sandwich into quarters and serve immediately or wrap for later.