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Correct — it's .30-06 Springfield. Some times my fingers hit the wrong keys. Ooops.

There was actually a .30-03 Springfield. This was the first loading of the cartridge that used a 220-grain round nose bullet. All M1903 rifles made to chamber this cartridge were returned to Springfield Armory, Springfield, MA after the adoption of the .30-06 cartridge. The .30-06 round used a 173-grain pointed “Spitzer” boattailed bullet that gave better range and accuracy. This was known as the M1 loading. All .30-03 barrels (including those installed on rifles), were reworked to the new .30-06 (or M1) standard. In World War 2 and Korea, the standard was the M2 loading with a 150-grain, pointed, flat base bullet. The 150-grain loading is now the most commonly found.