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nitro-express · December 31, 2016, 06:50 PM

A large quantity of W 571 came my way, and I load 357 Mag.

Hodgdon did have date for HS-7, and that powder was repackaged 571.

For my application, mid power loads with GC lead bullets, the data I had seemed to be a bit stout.

I found that 9 gr works well for 155 > 166 gr Gas Checked bullets. I cast up Lyman 358156 and RCBS 38-158-SWC with an alloy in abouts a BHN 14.5 and they work OK. I tried down as low as 8.5, with the 38-158-SWC, and I think that is as low as I would go. Up at 9.5 it gets a bit barky and starts to get the odd little streak of lead. I found printed data up higher than this, but I didn't see the need.

Also, a mag primer is recommended, I use a CCI, and with a standard primer, unburned powder becomes quite evident.

December 31, 2016, 06:50 PM	#6
nitro-express Member Join Date: November 10, 2011 Location: Rural Mb, near Winnipeg Posts: 18	Loading W 571 in the 357 Mag. A large quantity of W 571 came my way, and I load 357 Mag. Hodgdon did have date for HS-7, and that powder was repackaged 571. For my application, mid power loads with GC lead bullets, the data I had seemed to be a bit stout. I found that 9 gr works well for 155 > 166 gr Gas Checked bullets. I cast up Lyman 358156 and RCBS 38-158-SWC with an alloy in abouts a BHN 14.5 and they work OK. I tried down as low as 8.5, with the 38-158-SWC, and I think that is as low as I would go. Up at 9.5 it gets a bit barky and starts to get the odd little streak of lead. I found printed data up higher than this, but I didn't see the need. Also, a mag primer is recommended, I use a CCI, and with a standard primer, unburned powder becomes quite evident.