Rocnerd,
Yes I’ve tried the Federal EFMJ (Expanding Full Metal Jacketed) ammo in .45ACP, .40S&W and 9mm. It tends to expand on hard targets which may cause under penetration. Even in wet phone books it expands pretty quickly, therefore it doesn’t penetrate as well as the hollow points I tested it with, like Speer GDHP or Federal HydraShok. The .40s and .45s will expand to about .60 caliber, so if you want quick extreme expansion these rounds my be for you. Or if your area doesn’t allow hollow points then this may be a good choice. I think I would alternate it with better penetrating rounds though.
Ed