Know exactly what your talking about in the penetration department. Lastyear at K’Zoo I carried a brand new 12″ thick Black Hole target for my part of the siminar. With only afew shot in it (while at the siminar) I was putting approx 3″ of arrow out the back. Until I went to high FOC arrows one of these targets would last me pretty close to a year. Since the siminar I can’t shoot anywhere close to the center of the target without poking arrow out the back.:D
BTW, I was only shooting a 55# bow while there.