§ 403. Mortality and other tables. In all valuations made under this article where such valuation depends upon the continuance of, or upon the termination of a life or lives in being, the table of mortality prescribed by § 4217 of the insurance law for new, ordinary life policies shall be employed in the manner required by accepted actuarial practice. If, in any case, such table fails to provide required data, other tables accepted by actuarial practice may be employed.