Before I learned to avoid the situation in the first place I used a Lewis Lead Remover
Always cringed a little bit every time I pulled that down the bore but it did get the lead out.
Had a S&W 27 that just seemed determined to lead up. Traded it off years ago. The 1911 leaded too but switched to Berry's and Rainier copper plated and no more lead.
I can't say whether the Lewis is safe practice or not but it will quickly remove lead.