Hollow 8" concrete blocks or solid concrete blocks?
Last time I shot plain old 8" hollow blocks my 9mm punched right through with ease as expected.
They will hold up well with a lot of pressure bearing down on them from above, but give them a whack from the side and they crumble, got yelled at for that one time, was 10 and had a hammer. It doesn't take much to bust them.
MD
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