If a fella had a biggish box of cheap 158 JHP’s (old Star Bullets) and plenty of brass, what would you guys load up for a bulk blasting load. They will be mostly fired out of a trio of lever actions and a revolver or two as well. I’ve got a decent amount of 2400, plenty Unique and Lil Gun as well as a few others.

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In the powders you listed, for the 357 round, I'd opt for the 2400. In fact, that's what I did the last time I ran a bunch of those.

I use a out of the book load of Accurate #9, if your going to shoot in cold weather - 32 or so , use a mag primer. don`t ask how I found that out! my 2 cents

I’m old school on .357 and .38 Special.
I’ve shot thousands if rounds of 15.0 gr 2400 with a 158 and just a few thousands less of 8 gr Unique and a 158 as full lloads. For a lighter touch I liked 12.5 gr 2400 in .357 cases. I also shot a lot of 5 gr Unique in 38 Sp brass.

Out of you list, I would go for 2400.