If you get leaded up most will say get a Lewis Lead Remover. They do work. I have one, but I've found that cutting a patch from one of those lead remover cloths and running it down the barrel with a brass jag tip does just as well, and is cheaper. In fact, the brass jag and a regular patch will remove a lot of it by itself. You need a tight fit, tight enough that you have to struggle a little bit to get it started. I usually do two passes with a regular patch and finish up with the lead remover cloth. Plastic jags won't work, and slotted tips are useless.
I once shot up a bunch of 9mm lead reloads (that didn't work in my autos) in my Ruger Blackhawk convertible. Talk about leading, holy cow! Using this method it took me about 20 minutes to get it all out, and half of that was brushing it real well first.
A Pro-Shot jag is $7 and a Lead Remover cloth is like $10 on Amazon. The cloth will make 100 patches or more. Which is more leading than I'll ever get but there are other uses for the cloth. I don't normally get much leading.
The Lewis Lead Remover is retired. Except the forcing cone cleaner is so damn handy.