Sorry to bump an old thread, but I was hoping dillon would see this question in regards to this topic: I plan on buying the RT1200 trimmer with a 300 blk trim die, but I am definitely going to take your advice and cut the bulk of the brass off first with a chop saw. My question is this: after cutting with chop saw, the edges will be rough. Will I have to clean them up by chamfering before trimming in the RT1200? Or will it be ok to put the brass straight from the chopsaw into the trimmer? Thanks!