to303Modelo 303. IVA. Autoliquidación. Modelo 308. IVA. Régimen Especial del Recargo Equivalencia, artículo 30 bis del Reglamento del IVA y sujetos pasivos ocasional.It was the standard British and Commonwealth military cartridge for rifles and machine guns from 1889 until it was replaced by the 7.62×51mm NATO in the 1950s.