is there a way, in cog to make a railgun, that fires one raildet that when it explodes explodes into more raildets instead of shrapnels, then when those raildets explode, they explode into even more raildets and so on and so on. if so, please post how, or any ideas on how here. thanks in advance.

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I'm a leezard, honor my scales.

it's easy. Just bind a cog to the raildet projectile and in it handle the removed message. Create there as many new raildets as you want. You can look at the mortar of pwp2, the secondary fire is very similar to your idea...