Exact machining allows precise reloading by presenting a lot easier changes, improved alignment and easy operating. The S&W J-frames are a bit massive in your criteria, but I wouldn't go any smaller within a revolver. They may be just also hard to deal with and/or underpowered. For those who attempt https://shortgunammunition42862.wikitidings.com/6273349/top_guns_powder_for_sale_secrets