I was looking at my old Lyman 47th, and for 357 Magnum 125gr JHP it listed 17.7 of 2400 as the factory load, and likely most accurate. I'm confused, because the new Hornady lists 16.9 max (but with magnum primer?) Alliant data lists 17.5, and the current Lyman lists 17.7 (bolded as "best load") as well.

I made up some 17.0 and 17.5 (I checked and rechecked the measure, so the most it might throw is 17.6, most were 17.5 or a few 17.4) I'm using new Starline cases, CCI Small Pistol primers, and Montana Gold 125JHPs.

Has anyone else worked up to the top of 2400 with 125's? I'll report back after I shoot and measure them.

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Then we can hash out the 'forcing cone erosion issue' when shooting max power 125 grn 357 mag loads. Fact or fiction I'm not 100% sure, though I do think there is some truth to it. Part of the reasoning is the high pressure/flame still going strong as the shorter bullet clears the case. This minute additional time adds to the 'flame cutting', more so than the usual anyway.

The books do list loads. I don't have a whole lot of use for max power 125 grn loads out of a 357 though. Just something to consider, one guy's opinion.