Boxer pointed me in the right direction on my 223 AI build last year. 21" pac-nor 3 groove 8 twist in a rem mtn contour stuffed in a Ti stock. I took me a little while to find a load but it is shooting good now and clocking an honest 3100 fps with 75g Amaxes.

The only light bullets I've played with other than fire forming are the 53g vmaxes and they are clocking over 3500 fps and shooting 1/2 moa or better. I'm not even running moly.

Bb