Congratulations. I know you've put a lot of effort into getting there. I have acquired another .243 barrel and in first bench test it grouped Hornady factory 58 grainers into 2" for 6 shots at 100 yds. (I discovered my cheesey scope rings have loosened and will re-shoot that test group).It's the ammo I had on hand at the time. 3700 fps per Hornady! I think this barrel is a keeper, locks up gutentiet, like a German virgin. My problem now is the receiver it fit on has a very heavy trigger. See my post in another thread about that, different topic. My illness compells me to shoot home made cast bullets in Everything I Own, so that's next.