The picture here is of 3 cases: An original Winchester 8x56 M-S which has never been fired, next is a Remington 8x57 Mauser, and last is an 8x56 M-S that has been correctly sized to fit my chamber. The shoulder has been moved forward a little.
https://i1160.photobucket.com/albums/q488/JodyPBahamaNC/Steyr-Mannlicher_zpsoz3fme3d.jpg

Notice the shoulder on the last case looks a little further forward than the 8x57 Mauser case. After reading kuduae's post I tried an 8mm Mauser in my rifle-it chambered with no issue. I tried a PPU 8x57 200grain Match round, it chambered as well. Tried a few Military rounds with 150 gr bullet and only 2 of them would go in the magazine, but the second round would not chamber from the magazine. Only the first round would work through the action. So evidently no one bother to change the magazine. As soon as I get some more 8x56 rounds loaded I will try these in the magazine. It looks like I have a mutt instead of a German Shepherd.