(57) The invention relates to an armour-piercing projectile of the type which comprises a nose cone (1) with a rein­forced tip (2) for mechanical penetration of reactive armour and an impact contact member (5), placed in the nose cone, for triggering the actuation part of the projectile upon impact against a target. The casing of the nose cone has a weak point (12) where the casing is designed to be deformed and make electrical contact with the contact member (5) upon impact of the projectile against a target. In order to prevent undesired particles in the form of metal shavings or the like from coming in between the casing and the inner shell of the contact member, a sealing ring (14) is inserted between the casing and the inner shell (5) at the rear part of the nose cone. This reduces the risk of unintentional contact function caused by such shavings or flakes situated between the shells in those parts where the contact distance is small.