By definition, "assault rifles" are selective-fire weapons firing intermediate power rounds. Examples of these intermediate rounds are: 5.56x45mm, 7.62x39mm, 7.92x33mm, 5.45x39mm, and 6.5mm Arisaka.
Examples of "battle rifle" (full-power) rounds are: 8x57mm, .30-06, 7.62x54mm, 6.5x55mm, and 7.62x51mm. Even if one fired these rounds automatically, the weapon would NOT be an "assault rifle".
John