This sounds right up my alley. What is the basic dice system like. is it a new system or are you using a pre-existing system.
For this game we built a system from scratch! Dice rolling is all 1d6; you're aiming to roll under the appropriate stat. To represent "supernaturally good aim," you can often shoot or use certain abilities without having to roll at all, but it might require spending Powder - which also serves as your health pool.