Mark, I reloaded specialized shotshells for many years. While there are a ton of places to find info, and many different reloading manuals available, if you want to TRULY load a specialized load for your personal use, I would suggest that you contact Ballistic Products. www.ballisticproducts.com They offer specialized shot cups and other components and have load recipes that are tailored to work with their products. Their components are a little pricey, but when you consider the product and the results that you get, it's worth the added cost.
You can't load shotshells on a metallic reloader. I would suggest a MEC reloader. They'll do practically anything that you require.
Don't take shotshell reloading lightly. A component substitution can bring about dramatic pressure changes and destroy a shotgun. Different hulls have different internal capacities, and something as simple as adding buffer to the pellet load will cause a sharp pressure increase. It's easy, fun, and brings satisfaction if done properly.
