Heavy .38/55 load suggestions

[nitroproof]

I have a Hoch 310 grain semi-spitzer mold, looking for smokeless load suggestion and not sure where to start.

It's for a Whitney Rolling block (1880's) so mild loads only, this was my silhouette boolit... I've shot Holy Black loads with the big Hoch slug.

I have 4759, IMR-4198, 2400, Unique, 700x & 3031 on hand but am open to other suggestions.

Thanks,

[school of mines]

I have found some loads for lymans 335 grain boolit in their latest load book. I'm using their data with 5744. Just loaded some, so no range report yet!