There are lots of different types to choose from. My preference is the Wilson In-Line Seater with a micrometer top. They require an arbor press. The features that sold me on this type.
Precision machining: The case body is held in place with very little radial clearance. Mine are all tight enough that the loaded cartridge will not fall out of the die because there is a “suction” created that tends to hold it in place. Also note that the seater stem is quite long and also fits with precision.
In addition to the standard SAAMI chamberings, they sell “blanks” which your gunsmith runs in the same reamer used to chamber your rifle to create a “custom” seater. So, no problem finding a seater for any wildcat you can think of...
The arbor press in the pic was purchased from Busy Bee tools when they were on sale for about $80.00