I don't consider the nailbomb to be metal sounding by itself
it is a rock pup indeed, but will pull out bluesy stuff with moderate ease, and a variety of rock styles...
everytime I hear guys like Guthrie Govan, Steve Morse, John Sykes and some Doug Aldrich stuff, I can picture them picking nailbombs
Chris George and Sam Coulson are good examples of very versatile nailbomb users
of course if you play with pots dimed into a 5150 or rectifier and spank palm muted strings, it will sound metal
the gibson 500t is similar voiced, but definitely hotter (well, triple thick ceramic magnets), edgier, harsher and more compressed, and people still use it for everything
the rebell yell should work, but I don't think it will give the guitar more balls than the fatty, compressed and tasteless 498t
way more articulation and spank, definitely yes, but not huge balls