more old school like helmet and the rollins band counted?
back in the early - mid '90s, hardcore also refers to another kind of underground /rave club music in the UK, the predecessor to what was later known as drum-and-bass. basically, the DJs play hiphop beats records at the wrong RPM!
the harder version was known as 'gabba' or gabber? something like that .. i think that came out from Holland or something, or one of those Scandinavian countries?