I’m actually running an old west horror / conspiracies game I wouldn’t have thought of if you hadn’t shared that magic bullet. I have my players organized and everything. I adapted the healing bullet you described. I wanted to share these magic bullets I created for it (GURPS rules).

https://docs.google.com/document/d/1O5G-D_WOAMRNq1f3Ev2Ytz4HxTYQXS7SaPlzgIJVZYk/edit?usp=sharing