During my number crunching, it seems apparent to me that many guns exhibit range characteristics similar to their real-life counterparts. If you take the number on Papajohns' site, divide it by .00075 you should get the real range in yards. This held true for almost all the US battleship guns as well as some others I spot checked (Brit 14", German 11"/54.5, German 14.96" 1st set, US 4"/50, Japanese 5.5", you get the picture).
The US 14"/50 Mark 4 is an outlier... the NF range seems to coincide from the real range at 15 degrees, except the NF gun elevates to 30 degrees. That gun was mounted on the New Mexico and Tennessee... the New Mex was limited to 15, the Tenn could elevate to 30. Later both ships had new turrets for the 14"/50 (Mark 7 and Mark 11)
The next one that's problematic is the British 15"/42 RP12. If you guy by the N-model and use Papajohns' site, it would've fired 44,000 yards in reality according to my ratio. The only historical source I have on range is www.navweaps.com (I'm asking for more if you have them. Read the Royal Navy forum). Here is the link to that: http://www.navweaps.com/Weapons/WNBR_15-42_mk1.htm
If you look at the Navweaps chart, even WITH super-charges to augement range (which were never issued to the 15"/42s that could elevate to 30 degrees) it would only be 36,000 yards at 30 degrees... 44,000 at 50 degrees. The 15"/42 Mark II (turret used on HMS Hood, elevated to 30 degrees) seems to also have assumed supercharges, as the ratio yields 36,000 yards for it, and that's exactly what the chart shows for 30 degrees with supercharges. And the 15"/42 Mark I, limited to 20 degrees shows about 24,000 yards which would be WITHOUT supercharges. So the guns that DID get them are modelled in NavyField without them? (supercharges would give it 28,000 yards, or 21.00 on the NF range chart).
For the record, 32,000 yards (30 degrees w/o supercharges) would be 24.00 on the chart and 36,000 yards (30 deg w/ supercharges) would be 27.00.
I can only conclude that the 15"/42 Mark I is understated and the Mark II and Mark I/N RP12 are overstated.
BTW, the British 8" Triple (never mounted on any ship) had about equivalent range to the US 8" Mark 9, 10, 11, 13, and 14. That being just under 32,000 yards. The N-models are these guns are understated a bit, but what the British 8" really has going for it, is that the L and D offer a 13% increase/reduction whereas the US guns only offer a 9%.
That is, if the tables are actually correct.
Formula:
NF Range = Real Range * .00075 Apply to Papajohns' range chart
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