I'm planning on adding a Grey Knight to my Deathwatch game, using the Daemon Hunter book. While most things line up nicely (as intended), I noticed astartes storm bolters in Daemon Hunter only deal 1d10+9 damage instead of the 2d10+5 damage dealt by astartes storm bolters in Deathwatch. It says their "advantages they gain from their size and superior ammunition quality" are included in this figure; dealing less damage on average isn't much of an advantage. I don't have the Dark Heresy core book, so I'm guessing that astartes storm bolters are weaker there than in Deathwatch, in which case I should just use the Deathwatch statistics.

1d10+9 is the damage of stormbolter if you use the weapon table find in the DW errata. if you don't use it go for 2d10+5.

for a matter of fact the stat line from demon hunter are already errated like those in Black Crusade.