You don't have to go full tang vernier Jhon. The Marble Arms peep sights are really handy for 50-200m ranges. You can just use the standard front sight with them. Add a taller upright element and you can reach right out there. A standard post height on my Uberti 1873 44-40 lever action maxes out bang on 200m, but the 44-40 is a slow brick even compared to the 38.
Improved Peep Tang Sight