Over the years I have had several of these and used them all in black powder cartridge rifle matches. They were awesome shooters, using a Lyman 457193 mold with wheel weights...also used an Ox-Yoke Wonder Wad behind the bullet. You may need a slightly taller front sight to bring the groups to center. Virtually every trapdoor 45-70 I have used for shooting required this in order to lower the point of impact...additionally it made the front sight slightly wider. You only have to use material that will fit the front sight block blade cut-out. My current shooter I am listing on the EE and has had a reputation for spanking a Sharps in long range matches.