I was invited to go shoot at a new range with a friend , it is called The Governors Gun Club , Yes it was nice all Plexiglas (bullet proof I assume) state of the art. At any rate I pull out my cheep WM ammo & start loading my mags. My friend & the range officer ( who it seemed was always looking over my shoulder ) asked to see it I give them one box to look at & the range officer said you are not really suppose to use this in these guns. I just stuck my hand out for the box said thanks it runs great for me & turned my back to him.