Jeremy wrote:

http://www.nrsweb.com/shop/product_list.asp?deptid=1039

I have one of the 1/4 inch polypro lines, which I concluded recently
is NOT suitable for pulling things off of rocks.

Thanks for all your poste, Jeremy.

I have a 1/4 inch Spectra line, which has almost 3x the tensile strength
of polypro, but doesn't throw or coil as easily. It feels too stiff.
Whereas the 3/8" Spectra line handles more like a real rescue rope.
But the 1/4 Spectra was able to unwrap this boat without snapping, using
the (Boy-scoutless) "Ten Boy Scouts" method:

http://cacreeks.com/photos/antelop5.jpg

The yellow line you see in the picture going from the far side of the rock
to the lower right of the picture, did snap.

(Sorry about the subject; forgot to change it)