Re: Case Trimming
There are many other forum posts on this issue which bear directly on your need. Please feel free to use the Search tool. If you do an exhaustive search, you will see that a few of the posts are mine, because I had some of the same questions, i.e. is the Lathe type better than a Trim die.
Also, try using the RCBS site as there is a email address to ask questions and/or the Nosler reloading forum. There is also the Reloaders Nest, Chuck Hawk's, and a plethora of other internet sites and reloading manuals on this issue. As a final thought, you may want to try a Google or Yahoo search.
Presonally, I use the lathe type of case trimmer. To make life easy on me, I have one case per cartridge I handload for and use that to setup up my RCBS lathe type trimmer. Then I make a cut and check with the caliper. Just remember to tightenup the rings "real good".
As one person on this forum said, it takes patience.