I built my last 6.8 SPC with an ARP barrel. Exceptional
quality. I took some 90 Speer HP loads I have for a RRA
6.8 SPC upper, and they went sub-MOA. Now I am working some
95 gr. TTSX loads, where I am trying to ring out the most
velocity, and still get 1 MOA accuracy. The first batch of
development loads look promising.
Harrison has put a bunch of research in to chamber dimensions,
and twist rates. His barrels get the most out of the 6.8 SPC
cartridge.
Squeeze