Leading to an otherwise excellent ballance. Also barrel tip velocities would be reduced with ship roll and barrel continues aim motors won't need to be as large. The barrel is inherently stiffer being shorter, hence potentially more accurate also needing less stiffness to counter droop and being less inclined to whip. One could also up the calibre to a large 16 in, and have a lightweight turret throwing a powerful shell at reasonable velocities, almost like a carbine version. One could trade the barrel life for increased velocity.
If fired the lighter she'll it would still be doing around 2550 fps, on the rather small charge of around 150kg cordite and a large barrel life. The cost of all of this was a loss I have guestimmated or averaged at around 15fps per cal. The first world war German Baden at 45 cal was around 850 tons, but in its original form before its charge was dropped of high velocity had a rather large muzzle energy too. Nearly half the weight of Bismarcks turrets of 1056 tons. One can go to extremes and look at the older Italian 15 inch 40 cal which had a turret weight of only 550 tons. Well the Japanese 45 cal 16 inch turret was slightly lighter and carried more muzzle energy than Bismarcks 15 inch 52 cal. One then has to ask what consequences would this have. Noticed similar weight increases in other vessels like the British 12 inch and German 11 inch, but they had smaller circa 10% weight differences.
The difference in weight for this example was 1435 to 1730 tons. A good example is the American turrets on going from 45 cal to 50. It's turrets are large and the barrel is about the weight of most 16 inch barrels. A good example of this is Bismarcks long 52cal barrel, although others seem to define it at 47. So what I've found is the greater the barrel length in calibres the greater counter weight is needed to balance it, both on the barrel and the turret itself, and also the barrel needing extra stiffness from whipping and droop.
Found it interesting that, in one of the comments on the forum mentioned something that got me thinking and made me look into this topic that may at first sight not be consequential to actually have rather large impacts to overall design.
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