Here's a preset I've been playing around with, but had to find an older cabinet to blend in that had some bite to it for the squealy sounds (Vintage Celestion G12-65). I'm including that. It has three cabinets, actually four I think (2 variations of a classic 30 through different power amps & gear, but one is dead center mono and one is panned).

Preset: https://db.tt/glmffpLQ

Cabinet IR: https://db.tt/RFBhhlFH

Sample: https://dl.dropboxusercontent.com/u/21300833/PANTERA%20002/PANTERA%20002.mp3

Special note: Since it's kind of a wide mix of cabinets, I only panned 50% L/R. Good one to just jam around with dead center and get a bigger sound in one take.

Nice 2

Another good one, will check it out.

https://www.dropbox.com/s/l3whamls1ob5bx0/001%20iBlend.wav?dl=0

Here's another multicabinet, it's actually a more raw version of the one I included. I find that it feels better. The other might be best for playing around in headphones whereas this one will cut through the air more live or tracking with monitors.

Think of them as dark & bright. This one's bright/more like what IRs come like that you would buy...

Ownhammer's got some multicabinet IRs coming out soon, so this will probably be my last. I'm sure they can do it better.