Ammunition The rounds needed for the handgun you use, depend on the caliber of the firearm. The manufacturer should recommend it. The most common calibers are .22, the .25ACP and the .32. All weapons can used with deadly intent, however, they are not regarded as sufficiently powerful for the purpose of self defense. Any firearm is better than none, and the little .22 has been used successfully many times. Continue reading “Ammunition”