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Don Casey, among others, has written positively about the shock absorbing ability of lead. Makes sense from a physics perspective; the soft lead can deform and inelastically absorb most of the impact energy from the unyielding concrete.
BUT, if the boat was left in a position where she could slam repeatedly against a seawall AND a hatch was open for an extended period, and the boat didn't sink or do extensive damage to herself then, yes, you were lucky.