Benelli reads, but rarely do they comment.
To my knowledge, there have been no changes to improve the repeatable accuracy of the rifles once they are disassembled and reassembled. The same flaws are still very much there in the design.
As far as the accuracy potential of each rifle, I think it's there, but they seem to be more susceptible to load variances than most other rifles.
I believe there is a pet load out there for each R1, but it's going to cost you something to find it.
Even after that happens, the repeatability issue remains a serious concern.
The rifle has a specific purpose, and performs well within its limitations. It is not a highly accurate long range rifle.
Your best bet for that is to stick with the AR platform.