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I've forgotten what that other person was trying to accomplish, but the only time I've used Green or Red Dot in very small cartridges was to fireform Hornets into K-Hornets. For that, I used 3.5 of Red Dot and cheap 55 FMJ bullets. I didn't expect them to stabilize, so I never targeted or chronoed them.
In the .223 (or 221 or 222) the only useful purpose for such a load would be as a fireform or very mild indoor practice or rat load. Come to think of it, it would probably just about duplicate a .22LR load.
Hmmm... maybe I'll try a few of those some day.
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