I built a 22-243AI but my rifle is used for longrange groundhogs. It wears a 28" #7 Hart barrel with 8" twist.
I intended to shoot 80gr VLD bullets but the rifle showed a distinct preference for the 75gr A-Max bullet. A max load of RE22 produces 3,670 ft/sec and will shoot under .5moa. Very accurate and very deadly at any range short of 1,000 yards. Farther than that I haven't shot.
Only change I would have made would be to have ordered a 9" twist which would have been fast enough for the 75's.
One thing you might want to consider is the plain 22-243 rather than any of the varients which require fireforming. Velocity should be close, dies easier to get and barrel life will be improved if forming isn't necessary. Either way, I am very happy with my 22-243AI.
[ 11-26-2004: Message edited by: Varmint Hunter ]