You wouldn't think it has the power, but it does. I loaded a squib in .303 British once; put the 150gn bullet into the rifling. The danger condition is that it puts it far enough out that a bolt gun has room to feed the next round in behind it without the nose of the new bullet hitting the base of the old and warning you. An autoloader will, of course, not cycle on a load like that... but again, problems arise if the bullet got far enough out to let the next round chamber completely.