For all of you who were at the 2016 Muster and were asking...Those little black hollow balls given away by Hornady for the raffle are bolt end covers. They supposedly enhance your purchase on the bolt for a rapid second shot just before your trophy drops behind that hill 200 yds away. You remember, that hill too far away for you to get to because you are still out of shape like the rest of us old timers. I found them on another site which explained their use. SO, that takes care of that question that was burning it's way through your mind for the past couple of months.
Have a fun Fall.
LTC Montgomery Little, Senior Chaplain, GAF