Okla. Stat. tit. 21, § 21-1290.6: Prohibited ammunition

PROHIBITED AMMUNITION

Any concealed or unconcealed handgun when carried in a manner

authorized by the provisions of the Oklahoma Self-Defense Act and

when loaded with any ammunition which is either a restricted bullet

as defined by Section 1289.19 of this title or is larger than .45

caliber or is otherwise prohibited by law shall be deemed a

prohibited weapon for purposes of the Oklahoma Self-Defense Act.

Any person violating the provisions of this section shall be

punished for a criminal offense as provided by Section 1272 of this

title or any other applicable provision of law. In addition to any

criminal prosecution for a violation of the provisions of this

section, the licensee shall be subject to an administrative fine of

Five Hundred Dollars ($500.00), upon a hearing and determination by

the Oklahoma State Bureau of Investigation that the person is in

violation of the provisions of this section.