I think it would be nice to have a Large cannon type that had maybe 3-4 large shots (12-16 cannon ammo) in a magazine that would rotate when fired but you have a small storage for ammo so this is best used in bursts
New Weapon (Rotary cannon)
boombox Mausers are autocannon like the Mauser BK-27. It's a rotary drum system instead of rotary barrels. In fact the mauser was shipped to the US for investigation and from that experience the modern gatling was created. In this suggestion it's just placed on the floor but it's the same rotary principle to make things load and fire faster.
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I found this weapon suggestion interesting. Some info for anyone else who might be curious:
Revolver Cannon compared to Gatling guns
Automatic revolver cannon generally have a lower maximum sustained rate of fire than Gatling guns, as all the rounds are fired through a single barrel, which suffers from much higher heating loads. Some cannon caliber Gatling guns have a rate of fire of up to 10,000 rounds per minute (such as the Gryazev-Shipunov GSh-6-23), while revolver cannon typically have a rate of fire no more than 2,000 rounds per minute. On the other hand, revolver cannon are generally able to be made much lighter than gatling guns, requiring less support and mounting hardware. Gatling type guns spin the whole multiple barrel and breech assembly, which in equal caliber versions can weigh hundreds of kilograms more. The firing rate of a Gatling-type gun is directly related to the rotational speed of the barrel cluster. The need to accelerate this cluster requires generally a large external power-supply and means that the maximum attainable rate of fire is not instantaneously available. Revolver cannon do not suffer from these limitations. Another difference is found in the inherent greater accuracy of the revolver cannon over the Gatling-type guns, caused by the dispersion of multiple barrels rotating at a varying speed of the latter. Gatling-type guns are most effective against a large group of infantry, while revolver cannons, with bigger caliber rounds deal with enemy armor such as a Tank or a BTR.
https://en.wikipedia.org/wiki/Revolver_cannon
I actually had the same idea many years ago for torpedoes. The reasons are simple.
It would be meaningless to created it at regular gun size since they would be no different than existing ones. Hence, it got to be applied to something bigger. Obviously firepower will be high.
I'll probably create them sometime.
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I think it could be applied to the existing cannons with differences. I'm thinking large cannon in overall size but instead of 4 ammo for one shot, a burst of cannon shots. Say six standard cannon ammo for a three shot burst, rotary magazine holds a total of 18 standard cannon ammo (three bursts total). All 18 rounds need to be loaded before it can fire and those 18 rounds take longer to load then 18 rounds would (comparably) in the standard or large cannon.