It’s a matter of history that one of the first sporting uses of the .30-06 Springfield cartridge was by Boone and Crockett Club founder, Theodore Roosevelt, on his epic 1909-1910 safari. Except Roosevelt’s famous Springfield wasn’t actually a .30-06! Some time back I actually held that rifle at the Springfield Armory Museum, and the truth is it was chambered to the original 1903 version and never modified; thus, was actually a .30-03!