55#,

The highest SE/PDF ratio I've ever seen Norb Mullaney state is around what JeffB said 1.5, I think that was on a Martin 2 cam highly reflexed, low brace height riser job(got like 250 AMO on it). Typical high values are in the 1.4-1.45 range, and even then only on a fairly reflexed riser with radical one or 2 cams.