I have compared the weapon stats from Dark Heresy to those in Rogue Trader, and was surprised to find a lot of changes. Some weapons have higher (and for the power sword lower) Penetration, Damage has changed, bolt guns get Full Auto, and more, for a lot of weapons.
I was wondering: you reckon these changes should be considered a kind of Errata, or are they just changed to accomodate the higher power level of characters (and their adversaries) in RT?