I have not shot the 75s out of my Ruger but I have shot the 85gr Noslers and mine likes both IMR 4064 and H414, I really like my Bob, I was torn between the 257 and a 25-06 both Rugers, I got the Bob and never have regretted it.
I shoot the 87 gr Hornady or Sierra with IMR 4350. You will have to work up a load, I have a Remington 722 and am over the listed max. slightly so I won't state the load.