Scab Only Ogryn
 Ogryn Build - Warhammer 40k: Darktide 

Rock for sniping specials. Lorenz Rumbler for taking out specials if you run out of rock, but only if desperate since low ammo. Otherwise, use it entirely up on the monster that spawns in especially if it comes in at bad timing with scab wave. If you switch out the Rock for a grenade, then don't use the Lorenz - pick the Kickback or Grenadier otherwise the specials - snipers, bombers, and trappers - will kick your butt since you won't kill then ammo efficiently enough.

Headtaker and Slaughterer are used so you can spam the pickaxe heavy light combo as fast as you can with Just Getting Started +10% attack speed, yet still do enough damage to 1 shot crusher heads without any charge up once stacks pile up. Using Thrust or Crunch is not optimal since you waste time charging up your swing when you could be 1 shotting heads regardless. 

Be very careful with Indomitable, don't use it into the middle of a scab horde even if it looks tempting knocking the big boys over. You'll get trapped and die. Use it to knock over the closest 5 or 10 to you in a 1 second charge and then run out of the horde again. Otherwise save it for when you are trapped in a corner to rush out to open space.

This build is prima in scab only, but works great outside of it too, very fun. Very big bruiser bully ogryn energy.