Ogryn Slab Shield + Kickback + Rock + Taunt
 Ogryn Build - Warhammer 40k: Darktide 

Ogryn Tony - All rounder - Gabagool enjoyer. 
  

x3 21% health, x3 revive speed, x2 stamina regen, 1 5% health, x2 20% gunners, x1 15% corruption 

Stay Close! + Burst Limiter Override + Back Off! , alternatively Good Shootin' (currently testing).

main idea is Spray and Slay -- it's basically like having two purple nods - Burst Limiter Override + Spray and Slay is as powerful as Heavy Hitter AND Just Getting Started! combined:

its 15% melee dmg and 7.5% attack speed for 6 seconds for Spray and Slay instead of 24% dmg, 10% attack speed for Heavy Hitter AND Just Getting Started!.

You can also use Expansive for Kickback, so it could be 15% melee + 42% melee for 3.5 seconds, great to clear the hords melee. 

But I am using Blaze Away , checking its synergy with Burst Limiter Override .

No Pushover is for opening up Bulwark shield and killing it with Lorenz Mk V Kickback.

Dump stat for Orox Mk II & Mk III Battle Maul & Slab Shield is cleave damage, lesser enemies die due to Batter ;

60% defence is 0.9 stamina per push, 80% defence is 0.7 stamina per push, 4 pushes to put 40% brittleness = 3.6 stamina with 60% defences and 2.8 stamina with 80% defence. Slam helps with stamina regen too, you push alot, put brittleness, push+follow up attack is rather strong: weakspot dmg 10% stat, Brutal Momentum + Offensive Defence helps killing bigger enemies, Lorenz Mk V Kickback go kill Reapers/Bulwarks. 

Meanwhile the difference between 60% cleave and 80% is only 6-7%. Not a big deal, considering you've got Batter for more dmg to help to clear hoards.