What weight should they be on a 10,000 map
Well, there is no such thing as a 1:10,000 map according to HT. By the ISOM a 1:7,500 print should be 0.28. I think its .17 on the map. Clearly .28 is impossible. I just know I found the map hard to read in some places. I think some more black in the brown mix may have helped, or a printer with better resolution.
The file I have is 0.14, but that is for a so called 10,000 map.
The Brown was 0/56/100/18, I normally use 27 Black.
I'd like to think this partly explains why I sometimes completely failed to identify where I was up to on a leg, or even on the course!