I've seen the IMR 4759 powder mentioned a few times in my google search. I went to imrpowder.com and found this summery about the 4759. "really shines as a reduced load propellant for rifle cartridges. It's large grain size gives good loading density for reduced loads, enhancing velocity uniformity."
Here's what I found with the IMR 4759 powder that others have loaded as far as reduced recoil loads are concerned:
200 gr bul, 39 gr IMR 4759, 2335 fps.
250 gr bul, 32 gr IMR 4759, 1856 fps.
200 gr bul, 45 gr or less IMR 4759 for reduced recoil loads.
From what is in the Speer #13 manual and what others have done, do you think a 185 gr bullet with 35 gr IMR4759 powder would be a good load?