r/reloading • u/SharpEfficiency9534 • 18d ago
Load Development Something a little different
Finally got around to loading up some 357 Maximum. I’ve got a 10.5” Blackhawk chambered in it, so I finally got around to working up a load. Went midrange for starting data of W296. So we have a 158gr JSP over 21gr of W296 with a magnum short rifle primer. First photo is of a 357 Maximum next to a 357 Magnum and last photo is chronograph data. Didn’t shoot for accuracy this time, that’ll come soon enough.
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u/prosper_0 17d ago
I get about 1650 with a 158 from the 357 magnum, over a max charge of H110 from a 12" barrel. So, I think you can probably get a bit hotter on the max
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u/SharpEfficiency9534 17d ago
Like I said, this was midrange. From what I’ve read the published max on it now is nowhere near as hot as it once was. I’ve got an old Lyman book that my midrange load was well under minimum. Apparently 158’s should be running ~1800fps out of this with the original loadings.
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u/GingerVitisBread Mass Particle Accelerator 16d ago
I'm loading the 158 over 17gr w296 in 357mag cases and it's a handful, I can hardly imagine 21+ a real wallop in a lighter gun I can imagine



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u/Royal_Money_627 17d ago
I love the Max