Lee case trimmers do work. Tney are simple,but like anything else( any other brand of trimmer), you have to use it properly. If you try to tighten the case holder while the case bottom isn't resting on the holder flat and square, you won't get it tight enough. I've done a few thousand .223 with my lee trimmer. I've noticed I have more trouble when I have been trimming for a long period and get tired. When that happens, just stop and come back to it later.
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