From: La Salle, Colorado
Here is what he said:
I have no idea where the numbers for that 330mm on the Dunkerque came from. The 16in/50 numbers were produced by JWE (because RA/BTS use the DBB naval guns numbers, which he is the authority of) and are largely in line with my own estimates.
At first glace it looks like the range on the 330mm is correct - it had a maximum range of ~45,600 yards at 35 degrees elevation when firing its 1235lb AP rounds, and a muzzle velocity of 2850fps (which is damn fast).
In comparison, the 16in/50 Mk3 which only ever saw use as a coastal mounting had a range of ~45,100 yards, at an angle of 46 degrees and a muzzle velocity of 2650fps when firing 2240lb AP (same shell as on Colorado class).
However, I believe JWE ran the numbers for them with a maximum elevation of 30 degrees, like the turrets on the Colorado class, which would put their maximum range in the 36-37,000 yard mark. For reference, Colorado firing the same shell at 2520fps and 30 degrees has a range of 35,000 yards. I would probably have picked 36-37,000 yards for the 16in/50s, but the difference is fairly minor.
As for penetration - the 2240lb Mk5 APC at 2650fps (Constitution class) penetrates 22.3in of Class A at 15,000 yards, and 19in at 20,000 yards. In comparison the same shell at 2520fps (Colorado) has a penetration of 20.7in and 17.5in respectively. I think the 16in/50 Mk3 is a little underrated currently at only 2 more penetration than the 16in/45 on the Colorado, something in the 760-770 range would be more appropriate.
The French shell is a newer design than the 2240lb Mk5 (the post-44 US shells do not seem to be modelled apart from on the 16in/50 Mk7), and due its high velocity its performance is impressive despite its size, however it does seem to be overperforming here. At 2850fps its penetration is 19.8in and 16.8in of Class A respectively. This would put it between the 16in/45 on the Colorado and the 14in/50 on the Tennessee/NM, with a penetration value around 700. For reference the French 15in on the Richilieu is only 754 in game.
One last thing I notice is the Ammo count on the Dunkerque - these carried 110 rounds per gun, so an ammo number of 16 is a little high. Consider that the Alaska class CB carried 166 rounds per gun of 12in (so a fairly close comparison), and also gets a 16. I would give Dunkerque a 14 at most, probably a 13, given that the 14in gunned US Standard BBs get a 12 at 100 rounds per gun.
So, potential fix list;
1) Increase range on 16in/50 to 37,000 yards.
2) Decrease penetration on 330mm to 700-710 (maybe JWE could run the numbers for the DBB model?)
3) Decrease ammo on Dunkerque main battery to 13.