In game, it has a bigger warhead. I sunk the Yamato with 6 once. As for as using the range, really doesn't come into play in game no more than the M14. You'll end up wasting them if shooting at long range. In game they carry a wake, I assume as strong as the M14, although in reality the wake could barely be seen.
The equipment you have just doesn't give the data, even if it did it would still be luck. I think the M16 was around until the 70's.
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