Does anyone know where I can find old RCBS manufacture reloading die set for 20ga and 10ga shotgun shell? I allready have set for 12ga and now looking similar set for those other caliber. I shot by those 10ga and 20ga less than 50 shots at every year and those dies are ok in my use. So where can find those dies?

You might try www.huntingtons.com. They can probably assist you in finding what you want.