Brad, I'll take a good guess that you talked to died in the wool Black Powder Smurfs and they had a cardiac when you started talking Lyman #2 in the 45/70.
I have several good friends that are fanatics about BP Rifles and Bullets. They are fanatics about pure lead with 1% tin. For 5 years I spotted and called sight settings for several Master shooters during practice and the monthly 500 meter Silhouette matches. By the way, the tin really does little to alter the hardness, but it does cause the melt to fill in the mold better.
I always thought they needed a harder metal, but the belief amongst those critters is like a religious cult. They get all tensed up with any input.
Like the rest of these guys before me have said, it is so simple. The other day, a guy asked me what my mixture of metal was. He fainted when I said, "If it will melt, I will cast it".
Harold