For what it's worth, my father had a BAR in 7mm Rem Mag. It was a VERY accurate (0.5" MOA) semi-auto. . .when it wasn't at the factory being repaired! My Dad shot only factory ammo in this gun, and cleaned it after he shot it. It broke down ALOT.
He wrote a letter to Browning calling it, ". . . the most discombobulating piece of worthless pig iron it has ever been my displeasure to own or shoot!"
I don't know about the R-1, but I had a Reminton auto in .30-06 and took deer with it out to 300yds or so, and seen it hit steel targets at 500.
