Last year or so I was given an opportunity to scoop lead out of a local indoor range. I ended up with probably 11-12 gallons. The problem is that the backstop is rubber as you can see from the pics. So when I was melting my first batch the fumes from the rubber were overwhelming and stunk up the neighborhood. I then tried a quart or so in water to float the rubber. It worked but was very slow, I needed to sift through the bottom of the bucket while constantly skimming. Then the lead needed to dry before smelting. It was much improved but still had rubber in the mix. So I left the remaining in buckets for over a year or so.
So can anyone share how to remove the rubber from the lead? I assume there are easy ways that are not as effective or effective ways that are really difficult and time consuming.
Thanks for the replies.