I am using the RCBS, but have no way to check runout... It was holding 1 1/2 inch group at 100 yards which I figured is plenty good!
The other thing I have done when using cast in this gun was the JB weld in the plug and then push a bullet into it while still wet. It will form to your bullet and make seating better. Seemed to work ok for me, although I am no bench rest shooter, just a hunter!

......the occasional hunter wielding a hopelessly inaccurate rifle, living by the fantastical rule that this cartridge can deliver the goods, regardless of shot placement or rifle accuracy. The correct term for this is minute of ego.