I use a Forster classic trimmer for small batches and for setting the "template" case for large batches. The large batches I do on the Forster trimmer on the drill press shown above. I use the case that I trimmed to the desired length on the manual trimmer to set the depth stop on the drill press. Set up that way, I get less than 0.001" variation in case length. I added a 3-way cutter to the power trimmer to make things that much quicker by saving the need to chamfer and deburr. I've processed thousands of .223 cases like this over the last couple of years.