In the last Rogue Trader session I ran, one of the PC's wanted to use the butt of his pistol in an attempt to 'pistol whip'. This came about because I told him that ranged weapons cannot be used in melee.
I ruled that it was okay, but couldn't find what the appropriate damage would be so I just fudged it and based it on a club attack damage.
Is there a specific rule regarding using ranged weapons in melee? And do different weapons cause different damage (e.g. pisotal whipping as opposed to the butt of a rifle)