ORIGINAL: yeoman
Younggun -
By varying the bullet/sabot/powder in the Savage smokeless you could have the 308, 270 and 243 all in one gun! Well, maybe at 1/3 the yardages.
More like a 45-70, just can't use saboted bullets over 300 grains:
http://www.gunnersden.com/index.htm.45-70government.html
http://www.savagearms.com/images/pdf/manuals/MLII_loads.pdf