I Have Your Answer!
I have applied mathematics to your question and have found the perfect answer.
The average .25 ACP cartridge has a muzzle energy of 64.93 ft/lbs, and the .25 NAA cartridge has a muzzle energy of 127.00 ft/lbs.
Let's say that your firearm is the NAA Guardian .25 sub-compact pistol. This pistol weighs 13.57 oz. empty, which is to say it weighs 5,936.88 grains. If you could throw it at 95 mph, which is the speed that Major League baseball pitchers throw a fast ball. That velocity works out to be 139.36 fps, and will yield 257.51 ft/lbs of energy on your target.
This tells us that you will have a much higher energy on target if you just become more proficient in throwing your empty .25 caliber handgun. (Please be sure to remove the ammunition from the handgun before throwing to avoid an accidental discharge... Safety first.)
.25 ACP Cartridge
Projectile weight - 45 gr
Projectile velocity - 804 fps
Projectile energy - 64.93 ft/lbs
.25 NAA Cartridge
Projectile weight - 35 gr
Projectile velocity - 1275 fps
Projectile energy - 127.00 ft/lbs
Projectile weight - 5,936.88 gr
Projectile velocity - 139.36 fps
Projectile energy - 257.51 ft/lbs
Behold The Power of Mathematics!
Check it out for yourself: http://www.classifiercalc.com/misc_calcs/me.php
Safety Notice - Whether it is shot or thrown, you can still put an eye out with a .25 caliber handgun!