~S~
OK - seek and ye shall find. The Weight field indicates weight of the round in ounces.
I've also located a source of info for damage dice values for US bombs (
http://www.cfgse.calebflerk.com/index.htm).
250lb General Purpose = 1d1*500
500lb General Purpose = 1d1*1000
1000lb General Purpose = 1d1*2000
1600lb General Purpose = 1d1*3200
2000lb General Purpose = 1d1*4000
4000lb General Purpose = 1d1*8000
Do these seem about right, do you think? I'm not sure if they're not a bit low...
(Like I have the first idea what I'm talking about...
Cheers,
Pads