ORIGINAL: Terminus
I know, but isn't effect supposed to be based purely on weight of shell?
Yes, shell weight has been used by Gary's formulas in the past as well as other games. Fighting Steel also used this as a basic rule but after much debate, NWS lowered the values divorcing the gun effect value from mere weight because, as with this game, the high effect ratings based on weight alone produced too much damage per penetrating hit.
Probably doesn't matter much to be honest....i'm betting that there isn't that much difference between the damage caused by Yamato's 18in effect rating and the value you came up with for your BB.