I use Lincoln's shoe dye in a dark, or medium brown, color for the stripes. Feibing's leather dye sun fades so badly using it is a waste of time. Homer Dangler stain in a red, or orange, over the top make it pretty convincing. I noticed on a friends original Leman rifle that the artificial stripes were very uniform from the forend to about the wrist, and less so, from the wrist to the butt. I suspect the forward stripes were made with a gang brush, that applied several stripes at once. I made one from one of those four inch wide disposable brushes from Harbor Freight, by cutting out some bristles to give it the stripe pattern. I think if I were to do it again I would use the handle from this disposable brush and glue in some shortened finer point cheap artists brushes for the striping.
The old Leman's stripes started up near the barrel and tapered to the midline, where they either through wear, or intention got finer, and less pronounced. They do not match side to side, but then you can't see both sides of the rifle at the same time anyway. By all means practice on something before jumping onto your stock.
Most guns with artificial striping had a shellac, or varnish finish, that protected the striping. I used tru-oil, but didn't hand rub it in, I brushed it on and just rubbed it enough to level it out.
Hungry Horse