I've never tried feeding empties in my Mark V but I don't think a push feeder would do such a good job. But still it shifts the full ones nice and smooth. Mauser and derivatives are usually control fed which is why you could do what you state but let's be realistic gents, who spends time feeding empty casings to a hungry rifle? Or upside down for that matter? Interesting observation on your part.
I do....with my Model 21.....because it amuses me greatly.
