Randy
Here?s data I developed for the 500 JRH BFR 7.5 inch BBL with the Swift AF 325
Bullet = Swift 325 AF
COL = 1.775 inches
Primer = CCI 350
Brass = StarLine 500 S&W trimmed to JRH 1.4 inch
Velocity recorded by Lab Radar

Powder A#9
27.0 grains = 1490fs
27.5 grains = 1503fs
28.0 grains = 1528fs (Pet Load)
28.5 grains = 1543fs

VV N110
28.0 grains = 1448fs
29.0 grains = 1510fs
30.0 grains = 1564fs

Wet newsprint test at 50 yards with the 325 AF
Velocity 1523fs
Stopped at 13 inches
Bullet Diameter .736 inches
Weight 302.5 grains or 93%
Notes = Massive damage first 6 inches.

Good shooting
D..