I have been PC'ing some Speer swaged lead .38 cal 158 gr.SWC HP's and loading them in .357 magnum.
From what I can find, they are about 8 bhn, as a member of this forum tested them.
I cleaned off the wax lube that Speer puts on them with mineral spirits, heated them up in the PC oven for a few minutes to get the wax out of the hollowpoint. These swaged bullets mic at .355"-.356" so I gave them two coats of Smokes signal blue powder, which brought the up to .359-360" depending on how well the coating did. I then sized them to .358".
Shooting a stiff load with Bluedot out of a Smith Model 19 with 4 inch barrel I am getting right at 1200 fps, accurate and no leading.
The patches pictured are the first and 2nd patches after 18 rounds fired. Just some powder residue. It is not real comfy right now out in the woods, so that was all the rounds I fired. Had the F150 locked down in low range just to off the hardtop.
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