I thought would look into this cartridge (a guy on this forum wants to re-engineer the patented magazine clips, so that got me started on this

Anyhow, my practice is to use Quickload fitted to published velocity, psi data (had good results for other cartridges) and then apply that to a new cartridge lacking data.
Mr. Keeper wanted h4350. Lately, I have been getting into Staball6.5 (mostly for an upcoming 338-06 AI), so did that as well. Pierre van de Walt states that due it's short-fat case design, it is a natural for ball powders and the Staball6.5 results support this. The obligatory "anyone use this data at your own risk" ...
@SkullKeeper, here is the 4350. Now, QL, usually low on the bulk density, so filling ratio could be better.
For the staball, I measured its bulk density and use that here.