I tried them in my Parker Hale 6mm Remington. I didn't really perform very well with them. They seem to be just enough too long for its rifling twist. OK out to 150 yards or thereabouts but going sideways through the target at 200 yards.
These come in a small rectangular box with a clear polythene window on the top and a sort of shel that displays one bullet under that? The jackets are not true jackets but in fact put on by copper plating the bullets I believe.