I have used Brownells SteelBed on 8-10 rifles over the years and find it easy to use - for the same reasons as stated above, and the convience of everthing in one box means no searching for other components (Mixing cups, mixing sticks, measuring spoon, release agent, release agent applicator). The small kit costs $50.00 but you could definetly bed 4 rifles and probably 5 with it. SteelBed has an indefinite shelf life.
I have used Devcon, and JB, but after using SteelBed there is no going back.
Rob