I think some of you may be interested in this. I had this baffle box built a few years back using white pine boards. Then black powder loads (and a few smokeless ones from semi-autos) were fired from about 15 feet. The labels on the boards show where the bullets stopped. Of course a .44-40 wouldn't hold 40 grains or a 45 Colt, but I got about 33 to 35 grains of FFFg in them so they were snorty.
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