Dealing with Ossrum

This is Tim Banky's Borka 2 list that he designed to beat most of what Cygnar was playing at the time, especially Nemo 3:

conflictchamber.com/#c7201b_-0biViRiRjpiU7h0hjq6R6R0k0mk8

Trollbloods Army - 75 / 75 points
[Theme] The Power of Dhunia

[Borka 2] Borka, Vengeance of the Rimeshaws [+27]
- Earthborn Dire Troll [14]
- Earthborn Dire Troll [14]
- Mulg the Ancient [22]
- Rok [19]
- Storm Troll [9]
- Troll Axer [10]
- Trollkin Runebearer [0(5)]
Troll Whelps [0(4)]
Troll Whelps [0(4)]
Krielstone Bearer & Stone Scribes (min) [6]
- Stone Scribe Elder [3]
Lynus Wesselbaum & Edrea Lloryrr [5]

I thought that his feat might be of some help, but also you could lead with both Earthborns with their animus up and keep it on Borka. You might even be able to get some use out of Battle Charged.

If double Earthborns is the key though, you can always go back to Doomy 2 and try to out-threat him, but that's still easier said than done and wouldn't work if his shooting is still effective. Here's Mark Gerow's (gdnerd) list:

conflictchamber.com/#c7201b_-0b539D9DiRiRjp0hjq7d6R0l0m

Trollbloods Army - 75 / 75 points
[Theme] The Power of Dhunia

[Doomshaper 2] Hoarluk Doomshaper, Rage of Dhunia [+27]
- Dire Troll Mauler [15]
- Dire Troll Mauler [15]
- Earthborn Dire Troll [14]
- Earthborn Dire Troll [14]
- Mulg the Ancient [22]
- Troll Axer [10]
- Trollkin Runebearer [0(5)]
Janissa Stonetide [0(4)]
Troll Whelps [0(4)]
Krielstone Bearer & Stone Scribes (max) [9]
- Stone Scribe Elder [3]

Gunny is a possibility if you place his wall to vex the bulldozing. I have an idea for a list but I'll start a new thread.

Here's Jaden's (LoS Jaden) Grim Huge Bases list, because none of them can be pushed and he can not only slow the bunnies down but also disincentivize shooting with Return Fire.

conflictchamber.com/#c7201b_-0D59iWjqeC2Q0k0mi_6ej3hUhU

Trollbloods Army - 75 / 75 points
[Theme] Kriel Company

[Grim 1] Grim Angus [+29]
- Sea King [36]
- Trollkin Runebearer [0(5)]
Braylen Wanderheart, Trollkin Outlaw [0(5)]
Feralgeist [2]
Krielstone Bearer & Stone Scribes (min) [6]
- Stone Scribe Elder [3]
Pyg Lookouts (min) [7]
Thumper Crew [0(5)]
Hearthgut Hooch Hauler [18]
War Wagon [16]
War Wagon [16]

This video shows how Jaden beat Ossrum with that list: youtu.be/ApzwzJh6MxE

The problem I see with borka2 is that if your opponent plays an Hammerstrike osrum with double battle engine, you'll get oblitarated cause he has 20 weapon master dwarfs and a lot of powerfull shooting and critical stagger (with fire for effect ...).
Grim 1 4 huge base gets even more oblitarated against this thanks to the siege crawler.

Kolgrima is probably one the best options to deal with Osrum in general.

- Cloud wall mitigate the gunline
- The feat buys you a turn of shooting AND it stops the mini feat of the idrians (no cover for you guys !)
- Cursed fate make the dwarfs really easy to kill, even under the feat
- In SoTN, and if Osrum does not have battle engine, your prowl bears and lookouts can be a pain to deal with.
- Spray can kill the solos quite easily

I was too focused on the gun bunnies shoving everything around, but you specifically said that you weren't talking about the full-fledged spam list. Still, in that video, Jeff's list wasn't all that different from what you mentioned. If anything, it looks like he had more infantry.

Look especially at Round 2. Jeff felt some pressure too. He needed to get up the board and not just sit there with everything getting shot up. So he feats, arguably a bit early, but it can't be helped. He can't really save it or counter-feat Grim. However, Jaden is able to play around that anyway. Even going second, he's actually in a better position than you might think, though the scenario helps.

And yes, Ossrum has a lot of shooting here, but not much of it can really hurt the huge bases. He needs the Forgeguard for that, which is why the bunnies run in to jam first, while the grunts set up charges, but Grim could stop that with his feat.

The siege crawler variation is much, much, much less popular. 

Further, if it's shooting at me, I get to shoot quake guns on his turn which seems bad for him.