What Ammo Should I use?

i own a hi point .45 too and i use .45 FMJ ammo for both range and personal defense. use the 2nd lightest load. just make sure the ammo feeds and fires reliably. oh and put around 16 rds of ammo though each magazine to break them in and to polish the feed ramp to improve feeding. use 600 grit sandpaper to polish the feed ramp.