You can also try shooting some jacketed bullets through the gun which will help to clean out a lot of the lead. Then, use good cleaning methods.

There are some old cleaning jags that are made with small circular pieces of copper or brass screening that you push through the bore that do a quite nice job at cleaning the lead out without damaging the bore. These were called Lewis Lead Removers and I have used them. They are still available today:

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The old way to easily and quite effectively remove all lead without elbow grease was to plug the forcing cone end of the bore with a cork and fill the bore with mercury. The mercury would amalgamate with the lead and totally remove it all.

But, this was an old way that is NOT done today because of the known toxicity of mercury. I mention this because old gun magazines frequently mention this method used by many.

Don't do this, though. Just interesting to hear of how well it worked and how ignorant we were years ago about unknown dangers.

Good luck. I have removed lead from my revolvers for 40 years with a lot of good lead removing solutions and lots of brushing. It'll work!