As you might guess, it does not work out well. I had 4 guns I was sighting in and put an ELD-X .243 in a 6.5 PRC. It blew the plastic bolt shroud into my face and exploded the magazine. I was able to put the magazine back together but the shroud was destroyed. A bit of a gouge on my face, which is a penalty for being stupid, but otherwise just a lesson to pay attention. Just ordered a metal shroud from Tikka.