I know some of you have used a .490 RB, sized it to .459 and shot it in the 45 70.
I have some .490 round balls that I cast from WW many years ago. I tried sizing them in a Lee sizer die. I had to hammer the ball into the sizer die with my 16oz hammer, just to get it started, and then hammer on the steel push pin to drive it through the die. Good grief, it was a lot of hammering! Maybe the 20year old balls were as hard as rock?.....sure felt like it.
Pure lead would go through easier, even then trying to size them on the RCBS luber sizer from .490 down to .459 seems like a long shot.
How are you guys tackling this?