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Old September 13, 2021, 10:53 AM   #7
44 AMP
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Join Date: March 11, 2006
Location: Upper US
Posts: 24,265
If you don't have a reloading manual, and one that has the .357 Magnum in both the rifle and pistol sections, GET ONE!!

The first couple of my manuals that I looked at don't even list 231 in the .357 Magnum Rifle section. In the pistol section, they show 231 maxing out in the 1100fps range with a 158gr jacketed bullet from a 6" barrel.

Unique is in the rifle section, delivers 1400fps range speed with the 158gr there.

2400 is my choice, and the only powder I've been using in .357 for decades. Max loads from a carbine deliver he 158gr jacketed bullet into the 1800fps range, and you aren't going to get much more than that with anything you can use.

some manuals do show slightly higher speeds using H110 or W296, but the difference isn't much, and well within the difference that can result from simply using a different gun. I've used H110 and 296 in the .357, don't care for them, and while I do use them in .44Mag, in .357, I stick with 2400 powder, Been using it with good results for about 50 years, personally, I see no reason to change now.

Seriously, if you don't have a reloading manual, get one, or three....Get the one from Lyman for general stuff and get the one from the maker of the bullet you plan to use (Speer, Hornady, etc) for their tests and results with their bullets.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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