I've taken only one elk so far but I've seen 6 or 7 taken. ALL with 300 Win Mags.I put two 200 gr Grand Slams thru a big 5x5 at about 25 yards.Took out a shoulder with the second shot but the first would have killed him but he didn't realize it yet.Complete pass through with both shots.TN_Hunter,good plan to lose the Sierras,premium bullets do make a difference.