I never polish beyond 320. Rust bluing isn’t like hot bluing, it needs a little more to hold on to. I’ve seen very good results with guns polished with 150 grit...220 is a good happy medium and I promise that when you’re done, it will look right. The finish polishing gets done during the carding process. When in doubt, go one grit size larger, rather than smaller…I promise, you’ll like the results. I’m a fan of Laurel Mountain Forge.

Vintage and Double Gun Loony