Hey, just got through a test run of my tournament list. My opponent was playing 1500 to my 1250 (although I did make a mistake with my list as I was meant to be playing 1150).
Red Scorpions
HQ
Sevrin Loth -175
Chapter master - Bike + Artificer armour + Storm shield+ power fist - 210
Troops
Bike squad x 5 - 2 Grav guns, v.s. apothecary - 140
Bike squad x 5 - 2 Grav guns, v.s. apothecary - 140
Bike squad x 5 - 1 Grav gun- 115
Heavy Support
Devastator centurions x 3 - Grav Cannons - 250
Allies
Tigarius - 165
Troops
Scouts - 55
Grey knights
Grandmaster - Psy-cannon, force halberd.
Libraian - ml3, Liber daemonia,
TH
Troops
Terminators x 5 - Psy-cannon
Fast attack
10 x interceptors - 2 x incinerators,
TH
Heavy support
2 x Dread knight - H. Psy-cannon, H. incinerator
Allies
Vindicator assassin
I get 4 on strategic, loth has invisibility, terrify and shrouding.
Tigarius has gate, sanctuary and hammer hand.
The Grey Knights roll on
GK powers, plus divination.
Deployment
6 x 4 board with a decent amount of terrain, line of sight blocking ruin in the middle with a few hills and creators scattered around. There's 4 objectives, each worth 4 points, each at one corner of the board.
I've got first turn I keep everything off aside from my cent star, which I hide behind a small cottage. My opponent deploys his dread-knights and interceptors on the left and assassin on the right. I figure with invisibility on turn 1, I'll be untouchable.
Turn one
And.... I get seized on. I'm in utter dismay, not only am I out pointed but I my opponent just stole the initiative.
GK
He decides to go all out against my death star, jumping his knights and interceptors up. His terminators don't come in (thank god). He unloads everything onto my men, I brace myself for the storm and... I lose one centurion and my
CM + Tig loose a wound

. I get lucky, although I did make a mistake and assumed my cents automatically got the free apothecary upgrade (which they dont).
SM
I move my cents before casting invisibility (which gets denied) gate and sanctuary, I land in the centre right, just in range of his dreadknight. Since I blocked his sanctuary last turn I shoot my remaining grav cents into him, finishing him off for
FB. My
CM lands his orbital bombardment right on the interceptors killing 4.
Turn 2
GK
His terminators come in. He shuffles around his remaining units and gets a few of his powers off. His assassin goes for a turbo pen against my cents, hitting but failing to wound. His terminator unit unload their psy-cannons into the star, but the shots bounce off, with only my
CM taking a wound.
SM
Everything comes in, I edge my bikes towards his last dread-knight/ interceptors. My cents march up to the objective in the top right. I get my invisibility with 4 6's ( from 5 dice!) and loth takes a wound. I then terrify and shriek his assassin, he proceeds to roll a 14 and promptly fails his invulnerable saves

. My cents wipe his terminators, leaving only his Grandmaster and Librarian. My bikes demolish what's left of his forces, with only his fleeing thunder-hammer interceptor left on the board.
Turn 3
GK
He decides to move his grandmaster and librarian up, his interceptors face off my bikes. He casts force and skips to the assault phase, charging in his last units. His grandmaster instant kills my
CM and is slain in return. His last interceptor takes out a bike and we call it there, giving my opponent a bit of dignity.
Red Scorpion victory!
Definitely a few mistakes on my part, but even if my Cent star would of got wiped out I still would of tabled my opponent.