Accurate Arms #9 is a good magnum powder. I developed loads with 158 lead bullets I am certain it would work well with 125 Lead. It is a ball powder and it is a magnum level only.
I used to shoot 125's with 2400. This is an excellent and flexible powder, can be downloaded a bit, something you really should not do with AA#9 or H110.
H110 is perhaps the best of the magnum level only powders. I tested it with 158's and performance was excellent.
I stopped shooting 125's back in the 80's, huge fireballs and top strap etch, since then it has been 158's in the 357.
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If I'm not shooting, I'm reloading.
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