dalai, thanks for the info, it inspired me to do a hunt and this is what I found, it seems to coincide with with your suggested grades, you have probably seen it
http://www.natimuk.com/arapiles.net/boulder__1.html
there is also another two pages.
WM if you havn't seen this you may find it helpful re: more inspirational
anyone done some of these mentioned in the link, |