An ammunition unit, for combating targets (10) with or without using shaped charge effect, that incorporates an openable or removable and replaceable hull or outer casing (2). The explosive charge in the ammunition unit comprises a charge section (3) with shaped charge function arranged to be able to assume either of two freely selectable positions in the ammunition unit, the first of which enables the charge to exert its shaped charge function and the second of which disables the shaped charge function and enables a different effect to be triggered.