Some straightlines of that era, including the Star straightline, used what by today's standards was a weird full length resizing die. The case went into the gun. To get it out as the case rose up a rod pushed down on the inside of the case to force it back out. Weird. There was no conventional shell holder at the full length resizing station.
You machine use this odd kind of full length resizing? I've seen it on a couple pistol progressives, including the Star straightline, but I've never see it used on a rifle case.