HlynkaCG, on 08 September 2014 - 09:02 PM, said:
A nice rationalization, but it still doesn't make a lick of sense from an engineering standpoint. There's a reason that real-world auto cannons never caught on. The larger the round being fired, The breach block must move faster to maintain the same rate of fire. The breach block must also be larger/heavier in order to effectively handle the larger round.
Big heavy parts moving very fast require special consideration else the AC will quickly become more effective as a bomb than it is as a gun.
This is why modern tanks still fire single shots.
That's the thing though. Most ACs are actually small caliber. A few of the AC20s were big 185 MM cannons, and they fired 2-4 shots over the course of 10 seconds.
The most famous AC 20 is the Pontiac 100, which fired 100 (I wanna say 32mm rounds) each dealing 0.2 damage (makes sense considering the caliber), totaling up to 20 damage in 10 seconds.
So for them, the breach block was actually relatively small considering the size of the gun, allowing for the faster movement of the block.