![]() The Germans in the 1980s experimented with several leopard based hulls which carried twin 105mm or 120mm guns which were fixed in a casement structure. In battle, the amount of dust and other crap that is thrown up at the end of the barrel is quite large and that has to clear before you can acquire or reacquire your target. In the end, it comes down to how fast do you want to fire your gun. I suppose multi-barrel turrets are feasible (and used to be the norm) in ships is because the can handle the recoil far better than an MBT could. See 2S35 Koalitsiya-SV prototype or AMOS 120mm twin-barrelled mortar. You don't have to able to hit the same spot with the second shot (you don't want to, actually), so accuracy (paramount in an MBT) can be traded for increased rate of fire (in case you want to pop off a few rounds and get the hell outta Dodge before counter-battery fire can reach you) or longer sustained fire. It's probably a bit different for artillery pieces. If you are unsure your main gun will be able to take out a target with a single shot, it's probably more easier to devise a bigger or more precise gun than it is to cram in another gun of the same size. So rate of fire is not limited by the speed of the loader, but by the ability to (re-)acquire a target after the first shot in such a manner that it will be able to engage another target with precision. ![]() I reckon it will take a skilled loader about as long to load another round as the tank needs to right itself after the first shot and for the gunner to (re-)acquire a target. To engage targets independently, it will need to be even more complex. You'd need a second gun, possibly a second loader or autoloader (or a more complex autoloader), all of which will make your tank bigger and heavier (and more expensive), while possibly making it less mobile (assuming engine and suspension are rated up as well) and harder to conceal. I suppose there simply hasn't been any need for a near-instantaneous second shot capability. ![]()
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