Re: 6.5-06 vs 6.5X284 vs 6.5 Sherman
The accuracy from Benchmark barrels is without exception has been great. Barrels in my experience determine accuracy. All of my rimmed and unrimmed cartridges shoot exceptionally well.
In fact the rimmed case was designed for my Encores. I had a barrel in 338R Cooper Express for a small shank Savage made. I took a 300WSM barrel off my Striker, installed the new barrel and it was a 1 holer. Pulled a 473 bolt from another striker and replaced the WSM bolt and shot Nosler 280AI form cases in the striker.
For those that are not aware. The cases stay out of the Savage barrel .125 so the rimm cutter on the reamer is not relevant on the Savage barrels.
Both the rimmed and the rimless cases shot to the same POI. To date I have yet to Loose or anneal a RWS case. The are tough! I have not lost a case forming either.