Superhouse 15

I have loaded .22 cal airgun pellets into .223 brass with the flash hole drilled out and made primer-powered loads that were fun and could probably whap a bird or squirrel pretty good. I only fired them out of a T/C Contender and not a 20" AR, though. Might stick in a long barrel. Make sure you mark the brass so you don't load a full power load in that brass. I filed an X into the headstamp. A while ago I found a chart with loads for a bunch of different calibers using a little bit of Bullseye and plain lead round balls. If you did some searching, you could probably find something like that again. Some of the listed loads in the mainstream reloading manuals for .223 lead bullets are pretty mild, too.

Or, to avoid the hassle....

I have the Ceiner .22 conversion kit. http://www.brownells.com/aspx/ns/sto...ONVERSION+KITS
The kit and two magazines fit in a flat plastic box that about fits in a BDU cargo pocket. The 30 round mags are expensive, but these folks make good aftermarket mags.http://www.brownells.com/aspx/ns/sto...+LR+CONVERSION
Mine works fine but gets ammo sensitive if it gets too dirty. All you have to change is the bolt carrier and magazine.

I looked at Numrich, they list a couple of conversion adapters, but not in .223. I have the .30-06 to .32ACP and it works great out to 25 yards or so.

Cupcake

Yes, the .22 kit would not only apparantly be a better way to go (he does have a .22, BTW), but it would save save hime the trouble of getting into reloading:), although he's been considering in anyway.

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Stupidity is not a crime...so you are free to go.

Supertac45

I doubt that it would work out that great due to the greatly reduced loading.

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Les Baer 45
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Tubby45

From Hodgdon's site:

Madison at GT: 55gr FMJ 5.6gr Unique 1850fps

Litespeed 67 at GT: 40gr JHP 7gr Blue Dot 2000fps
" " 11gr Blue Dot 2600fps