I'm not in law enforcement. My chances of having to shoot through a vehicle windshield or door in self defense are minuscule, much tinier even than the remote chances of my having to shoot a flesh-and-blood target to save my bacon. I won't worry about continuing to carry the .38 Special FBI load or its equivalent.

If I were in a job that might call for penetrating car bodies or windshields, I would feel better with a good load in .40 S&W or .357 SIG.

Was the purpose of the OP research for a novel or short sory?

__________________
Oh well, what the hell.