The 6mm woa is not a 243 at all performance wise, but John Holliger is the one that came up with the round at the time and named it.
I don't need 243 and had the 6mm woa from him which is really accurate and works great on the target range, but mine is a hunter with 85 tsx strictly.
BUT if you want more... and don't want a 243 wssm(no flies on that either in the AR15) then get with Mike over at Dtech.
Those 2 at this point are about the only AR smiths I'd personally trust. THere is one other but I can't recall the name right now...
