I've used 9 gr of W-W 571 (same as or similar to HS-7) with cast in the 357. Works especially well with 358156 GC. I can't remember what source I used for this data.
Lots of variance in recommended max. Also, I've used a CCI SPM for all 571 loads in the 357 Mag.
I've used it with the 44 Mag as well, with cast, and it works OK. I finally settled on a CCI 300 LP primer and 12.5 gr. Somewhere around 10.5 and you will have smokey cases, not enough pressure to seal in the chamber. 12.5 gr will give you about 1000 fps. Increasing the powder charge and the gun will start to dance. Works best with a Gas Checked bullet. My goto is a 429434 GC, at about 225 gr, an old 44-40 rifle design. I've sub'd a 429244 @ 12.5 and at 1 gr less.
W-W 571 doesn't seem to be very kind to plain based cast, 2400 works better for that.
I don't think that W-W 571 would be my first choice for the 357, or 44 Mag. but I was given about 10#, and it works well enough for 1000 fps loads. I meters well. At 9 > 13 gr a round, I'll be shooting it for a while.
Last edited by nitro-express; 05-13-2017 at 02:05 PM.
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