would a standard wheel weight alloy be okay as a gaschecked 223 light load?
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223 bullet alloy question
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That would put 'em at about BHN 20, which should be enough for between 35,000 to 40,000 PSI. I'd slightly download my powder charge to approximately that level. Lee's book "Modern Reloading" has a good calculator for doing just those sorts of reduced loads, for several cartridges. You can refine your load from that starting point.
If you go this route, you might look into some H322. For full-power loads, there are better powders, but for somewhat reduced loads, H322's hard to beat."San Francisco Liberal With A Gun"
F***ing with people's heads, one gun show at a time. Hallelujah!
http://www.sanfranciscoliberalwithagun.com (reloading info w/ videos)
http://www.liberalsguncorner.com (podcast)
http://www.youtube.com/sfliberal (YouTube channel)
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