We've taken two elk so far with these bullets. One mature cow at 40yards and one mature bull at 150yards. The cow ran about 25yards stoped and went to run off again and fell over dead. The bull was shot twice but he never took a step after first shot went behind front shoulder got front of heart and absolutely destroyed offside shoulder splintering bone below scapula second shot went in the same but exited in front of off shoulder and he dropped immediately after that. I haven't recovered a bullet yet . I've done a lot of research on these bullets being more than enough beyond 500yards but we've only used inside 150 but would not hesitate stretching them out! The best group out of my Carl goustof 1900 is 1/2 inch at 100yards.