I have a crazy question. Has anyone tried to use a really really slow powder like H870? If you used enough of it and a heavy bullet, you might be able to get some interesting performance without high pressures.
When you don't have H870 at full pressure it seems to burn much cooler. My 22-250 heats up much slower when I use it in my loads.
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I don't carry a gun to go looking for trouble, I carry a gun in case trouble finds me.
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