No loads to share, but some free advice:

Don't shoot the bullets with the spitzer points or boat tails through a suppressor. Those supersonic drag reducing features are actually counterproductive at low muzzle velocities. These tend to pitch and yaw right out of the muzzle and that's hard on baffles.

A special high twist barrel with a heavy crimp and a 82 grn projo might get you more impulse energy to cycle the gun. However, I'd strongly suggest a blunt nose projo with a flat base. This is advice given to me by a person who has a commercial business making subsonic rounds for police and military. He's got the high speed photography of the transition ballistics to back it all up.

When downloading centerfire rifle cartridges, one needs to be mindful of detonation which can and does happen in undercharged cases with hot primers. Fillers aren't really an option for suppressed use. 7828 is a good choice of powders - especially the older stuff with the longer "pencil lead" grains. My 300 WBY Mag loves it too! It's a beeoch to meter though.

You can experiment with different bullet profiles and recipes, but at the end of the day, it's like building a glorified .22LR with a oversized case.

Here's a good read on subsonic projectiles.
http://members.shaw.ca/cronhelm/Subs...BC2C1156923879