It is indeed a pity that the fleet could only load their guns with solid metal hull penetrating shells instead of high explosive shells, due to the hull penetrating shell's higher velocity and effective firing distance making it the only kind of shell that can successfully reach the beach from this distance, with the current canon structure and firing powder they have on the ships. Or one did mention that he need to find an even more efficient kind of firing powder and also an improved forging technic, with materials with increased durability to make better artilleries.
But these hull penetrating shells are already enough for now, as these Ottoman formations approaching the seemingly trapped Romans totally did not expect a sudden series of shelling being poured on to their head. The visual shock of these metal balls as big as heads given to the ordinary Ottoman soldiers are already overwhelming them.