AAChang,
I believe in those who say one should carry what they practice with.
.45 ACP FMJ Practice Ammo? IMI 230 gr Ball ammo has very low flash, extremely good velocity repeatability and is waterproofed.
However, if I was carrying a 45 ACP for defense I would carry a +P 185 gr JHP which is more powerful, more effective and less likely to over penetrate.
230 gr ammo in 45 ACP is lower power and subsonic so it is better suited to suppressed shooting.
Good luck!
Regards,
George
In sunny Arizona