For use in the FsN, anything you find should be fine. There have been issues with the American Eagle branded stuff, but most of the issues are coming from the PS90. It is not the most consistent stuff, but for the range it has worked fine for me. The SS197 is the preferred plinking ammo for most people. The SS195 used to be good, but availability (and possibility that it was discontinued) has made finding it a bit more difficult. SS198 is great if you have access to it, but some sellers will only sell it to Law Enforcement, so it artificially has driven the cost above that of the SS197.