I competed in PPC and bullseye for 20 years, shot tens of thousands of swaged HBWC bullets. As pointed out previously, they are soft lead and they will lead your bore. I had a Lewis lead remover in my kit ( have no clue if they even make them anymore).....I would use it periodically to remove the lead buildup in my bullseye and PPC guns. It was the norm for those of us who shot cases of these rounds.
I have also loaded them backwards in limited quantities and never had any issues with skirts separating. In wet pulp, the reversed HBWC’s expanded nicely.