thats odd - My game shows 20 x 800k (rounding because lazy) for minirams mk1, giving me 16m damage, should be nearly enough to destroy a bomber in about 50k metal...
On normal caps, epic style, this does go down to 20x400k. (i note autobombs do similar things)
This feels more like an imbalance in combat styles more than anything else - comments on intent by devs?