I was looking over the Storm Bolter and noticed that it is supposed to have two regular clips to feed the dual mechanism. I was considering adjusting the stats to:
Clip: 28 (x2)
Reload: Full (x2)
This allows regular Bolter clips to be used with the weapon and allows it to reload each clip independently of the other. Needless to say, Storm drains ammo from both clips equally and the Storm Quality does not function if there are not sufficient rounds in both Clips for the attack.