It's not a profile and it only says to replace Rapid Fire or Pistol with Heavy 1.
My take would be, yes, they can fire special ammunition with Rending. (wording: [...]may choose
to gain the Rending special rule [...])
It's not a complete weapon profile.
Automatically Appended Next Post: JpBlitz wrote:So i can only use the Heavy 1 with Rending if i just use 'standard ammunition'? Ah shame, still gives the Sternguard even more firing options though!
Sternguard don't have standard ammunition. The only have 4 special ammunitions, so either it works with them, or not at all, as the
CT doesn't provide a full weapon profile.