72mustang
No offence taken.
The M-70's with the push feed bolt design was implimented as a cost cutting measure by Winchester. My 1973 M-70 was push feed, and to tell you the truth it worked flawlessly, was easy to clean, and the gun was very accurate. I never seen a need for the control round feed system.
All of the newer manufacture M-70's are of the control round feed system, which makes the bolt mechanics more intricate. The only issue I have with the new M-70's is that big honking extractor makes it very difficult to impossible to load a single round into the chamber and close the bolt.
In fact the owners manual states single rounds should be fed up from the mag to avoid difficulty in closing the bolt. I have a new featherweight in .243 and you can not feed single rounds into the chamber and close the bolt.
The M-70 made and established it's infamous reputation on the control round feed system and there was die hard grass roots effort to get it back after Wichester discontinued it. Perserverance finally prevailed.
The new Super Grade is a very nice rifle all the way around. High lustre blue, higher grade stock wood, with sculpted cheek piece, recessed sling mounts. It is one very nice gun for the money.
Several years back I tried and couldn't find a M-70 SG in 30-06 so I bought a Kimber 8400 Classic Select with the french walnut in 30-06. Nice rifle, very pricy compared to the M-70 SG, and I experienced feeding issues with it which are now solved but never should have arisen in my opinion in the first place.
Since eye balling and handling the Super Grade I will have one as I like it better than my Kimber which is a dam nice rifle in it's own right.
You can feed single rounds into the chamber of the Kimber and close the bolt as smooth as glass unlike the M-70.
So to try and answer your question in a nut shell the XTR M-70 is probably of a push feed bolt (for a couple years Win offered both configurations) design and it will be dressed in nice wood and general cosmetics.
The new Supergrades will be of control round feed bolt design and will have superior wood and blued finish with pachmar recoil pads and other little high end cosmetics.
Shoot a moose with either one and he won't be able to tell you the difference.