My carry gun is a .25 ACP Galesi, a really neat little pistol from Italy which has not been imported in many years. The conventional opinion is that the 50 grain FMJ bullet is the best performer in a .25 ACP pistol. Lighter faster expanding bullets usually don't and the heavy 50 grain bullet penetrates more deeply. I have found that the CCI Blazer 50 grain FMJ loading performs reliably in mine. Other types and brands, not so much.