Shooting cast lead bullets will warrant purchasing a suppressor that you can open and clean, so the Nano may be the best purchase. I've shot about 100 9mm cast bullets through my Cobra M2 and was really surprised at the amount of lead left behind. I've been shooting plated bullets since. Hope your project pans out and please post pics when you get it done!
Scrape some of that "lead" out and hit it with a tourch. Most times you will find that no silvery liquid comes out, which means its not lead. Im not saying it doesnt happen, because it does, but most times what people think is lead, is ussually not. Lead bullets require lube, which can come off in the can. Typically, if done correctly, lead bullets will leave less fouling behind in the bore than Jacketed bullets do. I tested a can with 300 rounds of cast bullets. It did have some fouling, but when you heat it, It doesnt turn into liquid lead, meaning it is of a different composition. If you get that much leading, you need to slug your bore and Mic it to see what is wrong with the setup. Ill have to figure out how to do a video so I can show you guys what I mean. If cast bullets are matched up to the gun correctly, there should be no lead at all in the can.