Course another thing you could do is have your 223 rechambered for 22-250. I haven't checked the cart OAL but I am pretty sure the 22-250 chamber job should clean up all the old chamber from the 223. I recently had a 223 shilen barrel rechambered for 22-250 and installed on my FN Mauser bolt rifle. My gunsmith also took about 1/4 inch off the chamber end to clean up the throat, etc as this was a used barrel with about 400 rounds thru it. Can't do that with the Handi barrel. Course, thats a shilen barrel not a micro groove Handi barrel. I also have a 223 Handi Ultra that seems to not like bullets any heavier than 55 grains. Both these barrels have the 1/12 twist. At this point I suspect it has something to do with the shallow grooves in the NEF barrel. As the 1/12 twist should handle 224 bullets up to about 64 grains. If you are after higher velocity and/or heavier bullets than the 223 will shoot, this may not be the way to go. Bout the only thing the 22-250 has over the 223 is maybe another 100 yards or so. Its not any more accurate in my opinion.
