Does anybody know if the Axis barreled action will fit any other Savage stocks besides the factory Axis furniture? What calibers separate the short from the long Axis receivers?
I have no idea about the axis stocks, but for the other part of your question - anything based on the unshortened 30-06 would be a long action - 30-06, 270, 280 and so on. Anything based on the .308 length would be a short action - ie. .308, 7mm-08, 243, most 6.5s and so on.
I don't think they will fit. The Axis does not have the traditional lug like other receivers have. As I understand it, only recently have aftermarket stock makers even started making stocks for the Axis.