OK with a 30-30 you shooting deer not flies . You get 3 in group's at 100 you good. You want better than that buy a 308. Lol
I can hit the metal plate target at 100yds with my Marlin iron sighted. As good as I could ever hope for deer hunting. I'm always sitting in the woods. I rarely have any need to shoot at something over 100 yds.