Well, if we are talking the 3000+ point bracket, if we really want to be talking one absolutely stupid amount of gauss shots- you can go
Zahndrekh (185)
Court-
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Transmogtek with harp of dissonance (60)
Overlord with res orb, warscythe, scarabs, weave, shifter (205)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
Lord with res orb, warscythe, scarabs, weave- (105)
(1500)
Troops
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
Warrior x20 (260)
Dedicated Transport- Ghost ark (115)
(4500)
Total-(6000)
All well and told, this puts out a whopping 360 gauss shots a round, with a potential 720 rapid. Now that's more dakka!
Edit- I don't know the point values you play at, but from here, while under
40k rules you cant add more warriors, you can get a royal court unit, like 5 crypteks with a pulse for both overlords, use them to turn out the lights for your approach, and hide em in one of the arks, firing that s8 ap2 lance out the sides behind an av13 wall.