Here is my tone.
I processed guitar tracks firstly in my DAW but i tone matched it so you can have it also. I cut out some offending frequencies and added compression to tame those palm mutes, and i also really like the compressed palm mute sound somehow..
On master buss i just added a little amount of high self boost but you don't really have to worry any of processing since it is already tone matched
I recorded 4 guitar tracks, 2x 100% Left and right and 2x 75% Left and right. I also duplicated all the four guitar tracks and added a room reverb(100% wet) and reversed the pannings.. It's neet trick to have guitar track sound huge
if you want to go further in processing, i would bet that sidechain compression on guitar tracks with kick and snare would be phenomenal!
I used Jackson RR24 loaded with EMG81 pickup and note that i didn't tone match any of metallica's guitar tracks
I used "ML Sound Lab" MKiic++ preset as a strating point and edit it to my tasting, i think i just reduced gain and added tape dist in front of amp, i really love to add it in front of MKIIc+ amps!
Here you go!