Yes, the .30-06 M2 should have been made with a boat tail but was in fact a flat-bottom spitzer... even though the advantages of boat tails were well known at the time.
The M2 was deliberately made flat-bottomed to decrease its maximum range, allowing it to be shot safely on certain US Army shooting ranges. This inbuilt handicap goes some of the way to explain why the .30-06 M2 goes transsonic at less range than the .303 Mk VII, the Mk VII in fact overtaking the more powerful .30-06 M2 downrange when fired simultaneously. The heavier, longer tortoise vs. the short, light, faster hare, but a friendly match.
The 8mm Mauser would take them both in that comp, only goes transsonic after a kilometre or more, but I have decided to disqualify it because it hurts your shoulder... )o:<
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