BruceP,
I believe that RCBS no longer offers the custom die service, I could be wrong. Check with them.
Redding was doing some custom dies also.
Unfortunately I found that both RCBS and Redding custom made dies were unecessarily expensive.
I find Redding to be a higher quailty die than RCBS. The RCBS is a top quality mass produced product, The Redding just little closer to a custom made hand fitted die, but still mass produced. For standard caliber dies I buy the Redding first then RCBS.
I have no experience with the Hornady dies. I haven't been able to find them when I needed dies. I am sitting here holding a set of their custom Grade New Demension Dies in 300 Win Mag that belong to my son. These dies appear to be a very high quality set of dies. I think I may have to buy a set of these dies just to try them. The label say these dies are available in their special order dies.
I understand Lee will make custom dies. I avoid Lee anything PERIOD. Some people tout Lee as a good start up product. When you are first starting up your dollars are precious and spending them on Lee Products is the same as flushing them down the toilet. Lee has a brilliant marketing strategy and fantastic design ideas, but execution stinks! Lee products are shoddy, minimal and made as cheaply as possible. Lee products have no durability and marginal strength. Sales is the goal of Lee.
I get all my custom or obsolete dies now from CH4D. They are top quality. Here is a link to their website. You will find their prices very competitive and alot more affordable in the custom end. Just Click on the link and you will be taken to their website.
http://www.ch4d.com/