hi, i have a set of irbis limbs rated @60@28 on a19"riser.All nature limbs are measured on 19"risers, so 60#s is a provisional measure.
Mine on a 17" satori are well into the 60s.With my bolts 3/turns out are 60 odd @ 29".Yes theres a mark on the limbs, from contact with
the riser when drawing the bow.This is right alongside the pocket, and they are about 2/3 mls in dia, it is absolutely nothing, actually its
just the top coat they spray on there is no physical sign of carbon wearing.Carbon is a tough substance just look at your arrows and what
abuse they can handle.I personally think alot of whats said about everything these days is bull/s.cheers.