Actually I think my math was off.
Max possible TB in Black Crusade for a human character is Toughness max roll 45 + 10 (Fortitude + Perfection) = 55 + 20 (all four increases) = 75 = TB7. TB8 if he has Mark of Nurgle.
In Only War it is: max roll 40 + 5 (don't heavy gunners get this?) + 20 (all stat increases) = 65 = 6. For an Ogryn it is 40 + 10 + 20 = 70 = 7 + (Unnatural Toughness +2) = 9.
Right, so maximum human TB in Black Crusade is actually 7, 8 if he has Mark of Nurgle. Whereas the max. Chaos Space Marine TB is 11, 12 for Mark of Nurgle. A bionic limb could bump this up to 9 (10) or 13 (14) in specific locations.
In Only War it is 6 (8 with bionics) for humans, 9 (11) for super cybernetic Ogryns.
Whereas max PC toughness bonus in Deathwatch is 50 +5 + 20 = 75, 7 x 2 = 14, +2 for bionics in specific locations = 16.
Edited by bogi_khaosa