Standard reloading dies are 7/8-14 thread pitch.
The lee carbide sizer die works just as well as other carbide sizer dies. The steel dies work as well.
The powder through expander dies work just fine with jacketed bullets, but generally don't work as well for cast.
In the case of the cast reloads, the Lyman M die is the way to go. I'ts seater plug flares nicely, and big enough for cast, and it also places a step into the flare to aid in setting the bullet straight in the brass.
I've found that some Lee bullet seater dies have a small enough bore to scrape a properly flared case upon entry into the die. Again, they will work fine for jacketed.
Also, the seater plug in the lee dies is generally a one size fits all approach. These can be replaced of course.
For example, pistol dies come with a round nose seater plug. When seating non round nose bullets, I noticed the bullets will sometimes seat crooked, which does not agree well with my hollowpointing jig.
The answer here is to replace the seater plug with either a flat plug, or a custom profiled plug.
I haven't had an issue with the lee lock rings, but were I to replace them, it would be with Hornady style lock rings. whereas the RCBS rings have a set screw that screws into the die threads, the hornady rings have a cross screw, that tightens the ring around the threads. Very positive lock, and doesn't damage your threads.
