Oh my lord. I am such a huge Stoner Metal fan it's not funny. However, I do feel a lot of it is clumped in that doesn't fit the mold, that is, sludge bands and/or psychedlic bands. Nevertheless, let me please add to the discussion (ripped from my Hidden Gems thread found here:
https://www.dreamtheaterforums.org/boards/index.php?topic=7969.0):
Black Water Rising -
https://www.myspace.com/blackwaterrisingIf you like big riffs, raspy but melodic vocals, and balls-to-the-wall riff rock, these guys are for you. Each song has a huge wall of guitars, mixed with a grooving rhythm section and gritty vocals. Stoner Metal and 70s classic rock mixed with modern Hard Rock edge at its best.
Throttlerod -
https://www.myspace.com/throttlerodGreat stoner metal band. Slick grooves, heavy riffs, great band all around. If you're a hard rock, riff guy like me, you'll love this band.
Karma To Burn -
www.myspace.com/karmatoburnDamn I love these guys. Karma To Burn is simply put the king of instrumental stoner metal. Their songs are filled with some of the sickest head-banging inducing riffs that will leave your neck sore. Check out "Twenty", "Twenty-five" and "Nineteen" Now. I mean it. NOW. Prepare to rock the fuck out.
Spiritual Beggars -
https://www.myspace.com/spiritualbeggarsThese guys might be more known to some of you than some others that I have posted, but that certainly doesn't mean that they aren't a hidden gem. Listen to their albums "Mantra III" and "Ad Astra" and you will understand that the Stoner rock grooves these guys emit are high quality. Great gritty lead vocals and thick guitars match the group's solid rhythm section to produce a Stoner rock sound that raise the bar.
There's a lot more where this came from.