I hunted area 40 without horses, the first year it was very warm. Didn't see any. The second year there was a good snow and I seen a HUGE herd (200+ head) get spooked opening morning and run right through a firing line of camps and roads. Shoots rang out for 45 mins with many decent bulls getting mowed down. I was to far away and ran across a huge meadow hoping to get a shot. Later in the hunt I could of taken a cow but passed hoping for a bull. I was disappointed in the area because there where so many hunters, mostly hunters from MN and WI and other then that one snow it was always very warm, again I didn't have horses. I lived in Sheridan at the time and most of the locals prefer area 38, but I had a neighbor who kept telling my how great 40 was and he knew where to go. I do not know about area 42 from looking at the map it looks like a high elevation area with much of it in the wilderness. If your guied knows the country and the weather treats you good I would say your odds of getting a 6pt 290+ bull is good and always a chance for a 350. What is the name of your outfitter and why do you want to hunt this area? I don't want to turn you away from it, the Bighorns are so nasty in places I'm sure there are elk that die of old age and have never seen a human. Horses are a must for that country and if you walk that far bring your repeling gear and I wouldn't take a gun!
WB