what mathman said.

have you checked bullet runout?
How anal are you when you reload your cartridges?

I shot the 6.5X284 in 1k BR for a bit. I was getting aggs of 8" with RL 22 and the 139 scenar. I also had great results with the 140 gr berger over RL 22

Someone else's magic load may not be yours though.