08-22-2011, 01:44 AM
michaelmew Wrote:I think the point you were trying to illustrate was the effects on a person standing behind a cmu barrier. But, if you stop and think about it, the bullet would have to go through 1 side of the block plus air space...then another layer of concrete block... I would like to see if the bullets can maintain their lethality after that second layer of block...I can tell you from my own experience in doing such a penetration test, that (at 100 yards) 5.56 M855 doesn't even get through the second side of a CMU, so would have no post-barrier lethality.
In contrast, 7.62 M80 not only punched through both sides of one block, but went through one side of another CMU positioned behind the first. (See attached drawing.)
It'd be very interesting to see if a 6.5 Grendel FMJ load can equal 7.62 M80 penetration of a CMU at 100 yards.