Good to know guys. I guess I'm too old school. I always thought that you needed lead in a bullet to penetrate and do the damage. I'm trying the XP3's at the range this week. And I guess they do have a lead pocket much like the Nosler, but with a solid copper nose and ballistic tip. I'm shooting elk with this and was just curious about knockdown on "BIG" game? I don't like chasin' them bastards!