I went and got my dies out and it has two RCBS dies and two Lee dies. Not sure what happened.
I looked through all my die boxes and couldn't find the missing die.

I looked for a set of Dillon dies but they are out of stock everywhere. I am not sure what to get for dies.

Any suggestion for a three die set.

On my 550, I have a mix of dies in most calibers.

A Lee set would be fine. Dillon and RCBS are good too, but no matter which one, I’d definitely get a carbide version.

I’ve switched from sets to specific dies. A Dillon or Lee carbide size die and Redding micrometer seat and a micrometer taper crimp die as they are easier to adjust when switching bullets.

Lee Precision sells dies individually

I would just buy the die that is missing

With some I have the mix of dies. I would just look for the one die you need, buy that.

I start with Midway & Grafs, see if any are on sale, eBay too if an ebay’er. Being the casual shooter & hunter, usually the cheapest is fine. If I can jump some in quality with a sale, better yet.

If I see a good price on Redding, I’ll usually go with that.

went to a local shop today. They had a Dillon
45ACP dies in stock. they were the same price as
Dillons website.
The shops inventory said negative six in stock.
the counter guy pulled a set out of the stack.

thank you for help