I know that in the recent version of 40K, Hell weapons AP was improved, but in Rogue Trader they have a greater penetrating power than plasma weapons? I may have missed it, but is there any clarification on this?

Thanks

Well, when you take into account the fact you can, if you accept the downside of the Recharge trait, add 10m to the range, 1d10 damage, and 2 to Pen, it's fine I think.

Where is this rule?

It's how hell weapons are intended to work. They fire a tight focused beam, while a plasma weapon fires a wider blast. Also in the table top war game hell guns have been given greatly increased AP. A plasma weapon is worth while against high toughness enemies as AP doesn't help. A better quality plasma weapon with the overcharging rules is quite powerful.

HappyDaze said:

In the weapons description...

Santiago said:

Just under the big title PLASMA WEAPONS. You can't miss it.

MILLANDSON said:

Yet, sadly enough, I did...

Thank you for pointing it out to me.

No worries man, at least you've spotted it now. They so should have had it as a weapon trait, like Storm. It'd have been easier to spot.