An 'average' Deathwatch space marine can throw a grenade at a standard range of about 30 metres (which actually means up to 60 metres without incurring a Long Range penalty). On page 151 it is stated that a 'miss' when throwing a grenade
goes in a random direction–see the scatter diagram on page 248.
The scatter diagram on page 248 explains that thrown weapons will scatter up to 5 metres in a random direction.
My point is, a lot of grenades used by the Deathwatch on page 150 have blast radii of 3 or more metres, making the chance of actually missing an enemy with a grenade very small compared to using any other ranged weapon (as any other ranged miss does not scatter within such a short range).
Is this a case of the scatter diagram on page 248 being calibrated for 'normal' humans? I understand many of the Deathwatch rules come straight over from Rogue Trader and Dark Heresy, and a human would only be able to throw a grenade some 20 metres at best, where a scatter of up to 5 metres is much more significant. But for a space marine, a scatter of 5 metres over a distance of 60 metres is minor, especially when the large blast ensures that a miss will still almost always hit.
(In fact, a frag grenade will always hit its target, regardless of the distance thrown! One can throw it at Extreme Range (beyond ~90 metres) with a -30 to-hit penalty, and a miss will still always hit the target due to the 5 metre blast radius)
Rewording of the question: I guess my question is am I reading the rules correctly, and should any modifications be needed?
- One can argue that the rules work as written, and space marines are indeed lethal with grenades.
- One can argue that the scatter distance should increase with thrown distance, in which case what's a reasonable house rule for this?
- Or maybe I'm missing some restriction on thrown weapons that takes this into account. Is there for example a maximum throw range that would prevent the 1000-metre grenade throw?