Before I sold my Ruger Redhawk 44 magnum a friend loaded some 210 grain but I can't say they were Speer as I don't remember. They were a flat lead point with copper around the outside. I shot a deer with them one year and was real pleased with the way they worked.

That group you have is not the end of the world. i think with some powder playing amounts that would tighten up. Maybe?