I own 2 of the original A-Bolts, one in .270 Winchester and the other in 7mm Rem Mag. Both guns shoot under an inch at 100, and with certain factory loads, my .270 can almost shoot through the same hole.
Some gunsmiths have told me that the original A-Bolts are better than the newer A-Bolt IIs. I don't know if this is true and, if it is, why that is. But I can tell you that if the newer A-Bolt IIs are almost as good as the original A-Bolts, then you should do just fine.
Zachary