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.