to convert some other alloys to 20-1. I cannot find the post to ask the individual, so in a blanket request, does anyone know what the formula would be for lead to add to change 20-1 to 30-1?
I've been trying to work it out, but my brain won't seem to grasp numbers right now.
Added: Thanks to all for the data. Reason asked is I tried some .45-70 loads using 30-1 instead of 20-1, and the rifle seemed to like the change.
And yes, there will be further testing before I start converting a bunch of stuff to the different alloy.