I was reading through the site this afternoon and noticed the threads regarding bulletholed items and that some of you suggested the possibility that they may be drilled/forged? It reminded me that about 15 years ago, before I had a chronograph, I was checking the power of one of my hunting air rifles after maintainance by taking a few shots at an enamel tin mug. The calibre was 5.56mm, similar to the holes in drago's coin. Out of curiousity I then buried and forgot about it. The thread encouraged me to go and dig it up. I've brushed off the loose dirt and enclose a couple of pictures.
I'm tempted to try the test on the range with various calibres of full bore rifle, but can't bring myself to ruin any of my steel helmet collection !
Please note; I'm not recommending anyone try this, the target was surrouded by sandbags, including over it because of the danger of richochetes.
Curious as ever,