.223 and 5.56 rifle ammunition has such velocity, energy, and effect that at close distances it's almost hard to make a bad choice. However, widely available data makes it easy to make better choices. Where unobstructed shots are expected and penetration of backstops and downrange hazards are of greatest concern, a lighter weight, lightly jacketed rapidly expanding varmint, OTM/HP, or some JSPs are a choice. If you expect barriers get stouter bullet construction like bonded SPs and copper solids, and certain heavier JSPs and OTMs.
Service ammunition in common use, subject to terminal ballistic testing, conducted to standard, and meeting recognized performance standards, offers the greatest flexibility and defenseability. Learn what your ammo does, to what, and when. Practice with it and place it accurately on target.
People use the label "M193" a lot. Remember that M193 is a particular round with an established specification and accountability. Most of what people call M193...isn't. It's 55 ball of some sort. I have used genuine and imitation M193, but learning occurred and I choose better.
Most manufacturer websites publish lab-grade gel shots and data on their LE/defense loads. Vista, Winchester, Hornady, Black Hills all have gel data online for viewing, and some will disclose more on particular rounds if you call and ask about a particular need.
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