I doubt they have any collector value. If you are looking to sell it, and want top dollar, shoot a good target with the gun at 50 yds. then put down all the load data on the target, and put it in a plastic binder, to attach to the trigger guard of the gun.
Then, buyers can see the gun, see how good its condition is, and then see how well it shoots with YOUR Best load, and get the details on the load used.
That takes a lot of work out of buying any used gun, and will draw a lot of interest away from guns that don't include this kind of pictoral information. Better, a buyer is going to be willing to pay more money for a gun where much of the work has already been done for him, than a used gun of unknown condition, where he has to work up the load himself.