The invention provides a marker projectile comprising a hollow body (1) having an opening (5) at the front; marker substance (8) disposed within the hollow body (1); and an expelling member (7) such as a metal ball within the hollow body (1), behind the marking substance (8). The hollow body (1) and expelling member (7) being configured such that upon impact of the projectile with a target, the momentum of the expelling member (7) relative to the hollow body (1) carries the expelling member (7) forwardly to expel the marking substance (8) through the opening (5), and characterised by a separator (4) extending at least partly over the front opening (5), the separator (4) defining two or more spaces (42a, 42b, 42c) through which the maker substance may pass when expelled through the opening (5).