I received a reply from Hornady on the bullets in question I sent to their lab for testing.Quote.......We did shoot the bullets into wax blocks at 2320fps and had 226gr weight retention.Then we shot them at 2009fps [distance impact velocity calculation] with 233gr retention.Bullets mushroomed well at .760" and .565" The ring is positioned quite a bit rearward.It is set at .210" from the base of the bullet.This could be why the bullet peeled back so far for you and came apart. I sectioned the more recent Hornady 286gr bullet and found no sign of the ring anywhere? Thoughts.........Harold