TNE rule question

I bought TNE yesterday (actually it was a gift for my birthday) and I was
reading through the combat system and had a question on a confusing area:
combat damage.

pg 285, 1st column, bottom
"Multiply the target's armor protection by the weapon's penetration value
and subtract the result from the weapon's damage value."

Using an example of a 12mm hunting rifle at short range (Pen = 2, Dam = 4)
and a visored helmet TL 10 (Armor value = 2), the resulting damage would
work out:

   AV x Pen       Damage Val - (AV x Pen)
    2 x 2   = 4       4      -     4      = 0    which means this doesn't
                                                 penetrate.

while the same armor versus a 9mm Rifle (TL7) (Pen = 1, Dam = 5) would give
a result of:

  AV x Pen        Damage Val - (AV x Pen)
   2 x 1    = 2       5      -     2      = 3    which means this does
                                                 penetrate.

So: A 9mm TL7 rifle will more easily penetrate a helm than a 12mm TL10
Rifle?

    This doesn't make sense. Help!!!?

 joe                          [phone removed]
 [email removed]