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I am loading for a full power .357 Magnum load for the first time. I have loaded tons of .38 special and some light to midrange .357's. I will be using H110 and HiTek coated 158gr cast bullets with a Brinell harness of 18. It is
these. I'll also be using Winchester WSPM magnum primers and mixed brass. I am seeing some confusing data and need some advice where to start. I'm seeing some advice online about using soft lead data and other saying jacketed data. I am working out of Lyman 49th and Speer 14.
Speer's only loading for lead 158gr is for low velocity and doesn't reference H110. All of their other data is for jacketed. Lyman 49th has loading for Linotype which I thought was soft lead, and jacketed. These are the two closest matches I can see in Lyman:
Linotype 160gr min: 15.8 / max: 16.5
jacketed 158gr min: 16.3 / max: 17.0
Should I be following the Linotype data with a good crimp and just watch my pressure signs?
I don't know if it makes a difference but these will be shot our of a GP100.
Yes it makes a difference.
Any advice is greatly appreciated.
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My 357 mag loads are shot in Rugers, Security Six and GP 100.
I cast and powder coat my 158 gr SWC for 357, your bullets should react the same.
When powder coating was new I worked my loads up using cast bullet data, then found that I could load my PC bullets the same as jacketed.
Never any leading. My bullets are from WW alloy.
17.0 grs of H-110 and a 158 gr PC or JHP is a
full magnum load. Lots of flame and recoil=
.
Start at 15.0 grs and work up.
If at any time you get sticky extraction, stop shooting that load as it's over pressure for you revolver. Drop back at least 1 gr.
With H-110 a magnum primer and a firm crimp is required for the best results. Good luck