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This cartridges box from the 1950's describes a 220 grain soft point bullet. This refers to the weight of the bullet and not how much gunpowder is in the cartridge case. The original M1906 .30-06 cartridge consisted of a 150 grain jacketed bullet. After WWI the weight of the bullet was increased to 173 grain for military use. Contemporary .30-06 bullet weights range from 110 to 220 grains.When speaking in terms of gun powder, the amount of powder, also expressed in grains, has a lot to do with the type of powder used. There's a variety of modern smokeless powder types with various burn rates for various application types.