Railgun shell payloads

#1
Hello there! i would like to know more about railgun payloads, and, since on wiki it did mention that putting a c4 increases the damage, I was wondering if putting steel, polycarbonate, phosphorus, chlorine or uranium inside would increase the damage without increasing the explosiveness or not? heavy core and chemical projectiles could be more effective against thick-skinned fish, such as the worm and that crab thing. For example, phosphorus would cause internal burns, while chlorine-loaded shell would cause damage over time, while the uranium-core projectile would be just really heavy and penetrate more of the creature's shell causing more damage. You would really save me a great deal of time if someone wrote a short guide on how the damage is affected my various items you put into the shell.