Which type of bullet design is the author noted for using with RCBS Cowboy dies?

The author is noted for using a cast bullet design with RCBS Cowboy dies because cast bullets are specifically designed for use in traditional and cowboy action shooting. These types of bullets are usually made from softer alloys of lead, making them easier to size and providing better accuracy for the low-velocity loads typically used in cowboy action shooting. The use of cast bullets aligns perfectly with the historical and cultural emphasis on traditional cartridge loading techniques in this shooting discipline.

In contrast, full metal jacket bullets are often utilized for military or self-defense purposes, as they are designed for reliable feeding and penetration but may not offer the same level of performance at lower speeds required in cowboy action shooting. Hollow point bullets are generally favored for hunting or defensive scenarios due to their expanding characteristics upon impact, which is not a primary concern in cowboy action. Lead-free bullets are more commonly used to reduce environmental lead exposure and comply with regulations, but they may not provide the nostalgic or authentic shooting experience that cast bullets offer in this context. This makes cast bullets the preferred choice in combination with RCBS Cowboy dies for this specific shooting style.