Charlie I think the Army used to use 1" pine boards for ballistic testing with the 45/70 they figured if it can punch through the board at X range then its still carrying enough energy to be lethal to a enemy. I want to say it would still go through the pine board at 3200 yards or something like that of course there was no accuracy at that range but a interesting study on the practicality of long range volley fire etc.
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