I've been using this spreadsheet I found which has a lot of info about the various weapons in Sandstorm, things like bullet damage over range, against different armour levels etc. You can even compare two at a time! I thought it was neat and should share it with you guys
Link to sheet in Google Drive
Disclaimer: I didn't do any of the work for this, just came across it on Reddit. The authors are credited on the "Introduction" page.