I didn’t think of the auto-loader angle. That would change the standard of living on the beach.
Yup, it does. The manually loaded M777 155mm/6.1” ‘lightweight’ towed howitzer has an average rate of fire of 2 rounds per minute with a ‘sprint’ burst rate of 7 rounds per minute with a very fresh crew.
The Mk45 127mm/5” 54 caliber Mod 4 gun on late-mark Burke class destroyers has a *sustained* 16-20 rounds per minute rate of fire, and it can continue that rate of fire until the ship runs out of ammo or the barrel overheats.
The new Constellation-class foreign-designed frigates the Navy is going to be building has as its base option a 57mm gun, but it’s not exactly weak: https://en.wikipedia.org/wiki/Bofors_57_mm_Naval_Automatic_Gun_L/70
They are looking to see if it can fit a 3” or 5” class gun.