The most forgotten, yet one of the most important aspect of metallicas tone from the black album era, is the Marshall BV cab. People chase that tone for years, getting down to extreme accuracy of the gear used on that record to get that tone, but then botch the factor that effected a huge part of that tone: the cab. So kudos to everyone that brought that up.
If you ever mic a Marshall BV cab with an era correct MD 421 and Unidyne sm57, you’ll see how important those aspects are for that sound. This is by no means perfect, but for 5 minutes of tweaking, this is pretty good in my opinion. Would’ve never gotten anywhere close to that sound without the BV cab and 421-U and Unidyne /sm57.
https://soundcloud.app.goo.gl/3Wuda9Qrv6HAH15J9