Allen, I consider the normal brummel to be 1, and the 5 brummel to that repeated 5 times, so it would be 10 pass thru's (5 each way). I don't know if there is any "official definition", but I believe that is also how Brian defines it. The 5 brummel (defined that way) was 80% strength.
I think this is right. I see Brion quoted on page 3 of this thread talking about a soft shackle as having a half brummel. 10 pass throughts takes up quite a bit of space so the single brummel and a short bury becomes more interesting. I look forward to hearing the results when you get back to your test jig.