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Most people think that there's little difference between a 22LR and a 223/5.56 round.  Caliber is almost the same that's why you can get a 22LR conversion kit and drop it into any AR15/M16/M4.  It works and works pretty good.

Here's a little table that demonstrates the difference between the two in terms of velocity (average muzzle), mass and Energy (Joules).

 
Velocity ft/sec Weight (g) Energy (J)
22LR High Velocity  1,328  36  159
5.56x45 SS109  3,035  55  1,435


The 223/5.56 round has 9X or 900% more energy than a 22LR.  That's a huge difference.
For me shooting paper targets at the range using 223/5.56 is just throwing money away.  Its almost $.25 ever time you pull the trigger.

Next purchase is a CMMG India Evolution 22LR conversion kit for my XM177.

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