I got an e-mail back from Underwood tonight and sent them another one asking about the SWCHP +p 158gr. I will post the response when I get the new e-mail.
They do have a description on their website the talks about not leading the bbl,but I believe it’s for the +P. You can check it out.
They did give a bbl length for their test and specs on a 1&7/8” bbl which I will post when I get info on +P.
I have the same issue with chemicals. I use Rem Oil with Teflon for cleaning with a brass bore brush. I’ve been meaning to try a snake.Nothing but good reviews. They do make a foam bore cleaner that touts no smell. Thinking about that also. Old habits are hard to break after 50 years!
I don’t know anything about cleaning lead out of a bbl but I am sure there are lots of videos on YouTube.