AdamWillow
Banded Mongoose
You've helped me a lot so I come to you with another noob question 
Enemy in battledress with Armour of 29.
Team sniper with gauss rifle and special ammo (ARMOUR PIERCING DISCARDING SABOT) has 5D dmg and 21 AP (6 normal plus AP trait equal to triple the number of damage dice it rolls.)
2 situations:
He hits and rolls 22 for dmg. How much dmg do I apply? Armour 29-21 AP, so effective armour is 8 and the final dmg is 22-8=14?
He hits and rolls 14 for dmg. Effective armour is 8, so final dmg is 6?
Additional question.
In CSC you can read:
A weapon must have a listed magazine cost in order to be able to use the ammunition in this chapter. In addition, the following weapons may also not use this ammunition.
One of the listed weapons is Magrail Weapons.
Gauss description: (...) rifles fire high-velocity projectiles using electromagnetic rails.
IMO it is kind of magrail weapon so you can't put special ammo there in the first place. Am I right?

Enemy in battledress with Armour of 29.
Team sniper with gauss rifle and special ammo (ARMOUR PIERCING DISCARDING SABOT) has 5D dmg and 21 AP (6 normal plus AP trait equal to triple the number of damage dice it rolls.)
2 situations:
He hits and rolls 22 for dmg. How much dmg do I apply? Armour 29-21 AP, so effective armour is 8 and the final dmg is 22-8=14?
He hits and rolls 14 for dmg. Effective armour is 8, so final dmg is 6?
Additional question.
In CSC you can read:
A weapon must have a listed magazine cost in order to be able to use the ammunition in this chapter. In addition, the following weapons may also not use this ammunition.
One of the listed weapons is Magrail Weapons.
Gauss description: (...) rifles fire high-velocity projectiles using electromagnetic rails.
IMO it is kind of magrail weapon so you can't put special ammo there in the first place. Am I right?