I've done my loops according to Opie's tutorial and i have had no issues (I currently/ most recently use them as prussics for my Hennessy Exped). However, whenever I feel like I want the extra security, I make the buries longer. I'm at 7" buries for my new 12" loops (have a few at 8" as well) and I hung my full weight on hooks and bounced and so far no problems.
The key to immortality is first living a life worth remembering. - St. Augustine
Some people feel the rain. Others just get wet.
- Bob Marley