Rumbler Shots are Free
 Ogryn Build - Warhammer 40k: Darktide 

"The Tertium Elites don't want you to know this but the rumbler grenades are free, I have 572 rumbler grenades at home right now"
- John Ogryn
+++++++++++++++++
Do you love the Rumbler? Are you a fan of explosions and free stuff? Looking to bring your Rumbler into Auric and Havoc missions but you can never find enough ammo? Look no further than this build right here!

The Concept
+++++++++++++++++
The idea behind this build is easy. Using the Lucky Bullet Keystone Back Off! you taunt a horde, kill a few guys in melee and then you get a free rumbler shot or two (or three) to put into the elites or bosses that come your way. Rinse and repeat. The combination of extra damage from the taunt, suppression, and talents means that if you'll deal very good boss damage and kill most elites with two rumbler shots. Which happens to trigger often when you have Lucky Bullet. Any elites that survive the initial blasts will bleed/burn out or will be extremely fragile and staggered. Easily finished off with a couple stabs. And because you're triggering Lucky Bullet so often, your taunt regenerates very quickly as if you took the other talent. Allowing you to gather together hordes and then blow them up in an extremely ammo efficient manner. When enemies appear and you can't get off a rumbler shot then you fall back on your toughness regeneration from confident strike and other talents to tank the damage until the time comes where you can pop off more shots. While not the best ogryn weapon for specialist sniping, because you get free ammo so often you can also help to take care of bombers, snipers, and trappers that try and come ruin your runs.

Synchronicities

+++++++++++++++++
This build synchronizes very well with any other class build that deals extra suppression to enemies. Vets, flame psykers, book zealots all will help you trigger Coward Culling for that extra 20% damage and in turn you give them a damage boost as well. Survivalist vets in particular will help to ensure that you're almost never out of ammo, needing minimal pickups to keep you topped up. Celerity & Combat stimms (blue & red) also synchronize very well with this build as the increased attack speed and damage respectively will help you keep your toughness up in melee or help deal extra damage overall.

Shortcomings
+++++++++++++++++
Modifiers that make suppressing enemies more difficult or impossible (Nurgle's Blessings & Final Toll) will make it more difficult for you to proc extra damage on elites.
The Encroaching Garden modifier negates some of the extra damage dealt from bleed and burn stacks.

Variations
+++++++++++++++++
Valuable Distraction can be swapped for Go Again! if you wish to lean more into the distraction/tank aspect and spam taunts more often.
Pumped Up can be swapped for Strongman if you find yourself out of stamina too often.
The knife can be swapped out for other melee weapons such as bully clubs or pickaxes. Anything that you can spam light attacks with. I still recommend taking confident strike or other toughness regen blessing on your other choices.
The choice of blitz is up to personal preference but either frag or box of hurt will synchronize better with the chosen talents.