I did a std 223 on a Pierce TG action in an Eliseo R5 tubegun chassis. Chambered a 30" Bartein med Palma contour 5R, 1:7.2tw with my 223 Match reamer for it. This Pierce was one of the first 10 TGs they did, and I had to send both .473" & .387" bolts out to GreTan to have the boltfaces bushed. Used another TG a year later in an Eliseo RTS chassis with a 6.5x47 bbl; they'd tightened up the tolerances by that time, and that bolt didn't need bushed. Very slick actions - I've run them both in NRA XC HP matches, and they're a dream to run in the rapid strings.
I'd have no reservations about using a Pierce again - but after selling a nice M700/223 I'd put together with a Krieger 1:7.7 sendero bbl in a Greybull stock, I decided I needed another 223 to play with, then decided it needed to be a 223 AI. Since there was a NIB M700 action (one of the new M700 bare actions from Brownells) sitting right here in the office, I did the AI on it, chambering a 26" Krieger in sendero contour, and put it in a McM A5 (70% black/30% med gray marble) with RD Prec DMBM. My reamer has a throat that's just right for Berger 90s (both LRBT & VLDs) seated to jump .020" at AICS mag length, and it shoots great with either bullet seated to that length. Too much fun to shoot the little dickin's...I've taken it out to 1400yds and got hits on steel with it at that distance, but even with electronic muffs, I didn't hear the hits, nor did either of us see them until we went downrange to paint steel.
