CT
I assume the data you?re looking for is load data? Whit certainly has more experience with the JRH then I do.
My 500JRH is a 7.5? BFR just a little over three months old; I based my starting loads off published 475 Linebaugh data and worked up accordingly. I submit this data for the benefit of all, with the disclaimer to start low and work up. Most all my development has centered on the 325 Swift, it is my primary bullet choice for this gun\cartridge heading into the fall.

Swift 325 AF/HP
A#9 ? CCI350
Charge Velocity
27.0 1533fs
28.0 1565fs
28.5 1592fs

Swift 325 AF/HP
VV-N110 ? CCI350
Charge Velocity
28.0 1448fs
29.0 1510fs
30.0 1564fs

Hornady 350XTP
A#9 ? CCI300
Charge Velocity
26.2 1437fs

Hornady 350XTP
A4100 ? CCI300
Charge Velocity
27.0 1226fs