I'll put my tight neck 243ack up against a factory 243 any day shooting 95gr thru 115gr VLD's. Now after saying that, I've spent over the last 10yrs countless hours at the reloading and shooting bench. Would I choose a 243ack for my next build? Probably not. There are plenty of other cartridges out there that are more efficient and have better accuracy potential. As far as P.O. Ackley being ahead of his time? I think he was beneficial to the wildcatting movement but I think others made greater advances.