5-8% Strength for 4.5s on Kill. Stacks 5 times.
Hitting at least 3 enemies with an attack, restores 12-15% toughness.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
7-10% Strength for every 4 Single Target Hits. Lasts 2s and Stacks 5 times.
You are the Ogryn that brings a knife to a gunfight and a gun to a knifefight.
In melee, you are on horde clearing duty. Swing your knife left and right to cut down all those trash mobs. Its swing and movement speed allow you to act quickly and adapt as the situation unfolds. You'll notice that the knife won't help much against tougher enemies. That's when you pull out your stubber. You can easily dump the stability stat because you never really hip-fire that thing. Quickly pop out that handle and fire bursts at priority targets: Ragers, gunners and the like. Don't be afraid to close in on them as well. You're tough enough, big boy.
Armored enemies pose a little problem. Just hope someone else has a build to deal with those. Unless... Unless you activate your Point-Blank Barrage. Fire away and watch them burn. Literally! Fancy armor won't stop your helfire assault. Don't be afraid to use your stubber for regular hordes as well, but be aware that being trigger-happy drains your ammo supply quicker than your Ogryn can count to five. Burst-Limiter Override helps a bit, but you shouldn't rely on it too much. Also reload only when you have an opening. Or just use your ability to reload instantly, I guess...
Oh and your rock. Not much to say about the rock. Toss it at snipers for comedic reasons. Toss it at maulers while you're reloading until you're done. Toss it at shield ogryns and unload your magazine into their butt. So many fun applications.
Last but not least and very much the most fun part of the build is your ability to kill monsters. Pop a stim, activate Point-Blank Barrage and unload your entire magazine in an Emperor-honoring way right into the maw (?) of that charging chaos spawn. Laugh maniacally for bonus damage. That's also your strategy for when your team accidentally wakes a demon host.