Some sources will recommend trimming to 0.010" short of max length; some will recommend trimming to 0.020" short of max length. It doesn't really matter on bottleneck cartridges, unless you're dealing with a short-neck (like the Gibbs cartridges).
I consider 0.015" to 0.010" short of max to be my "butter zone". I tweak the trimmer until I'm in there somewhere, and run the brass through. Since it'll all be coming out at the same length, it doesn't matter if it's 0.013" short, 0.010" short, or 0.015"short.
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Don't even try it. It's even worse than the internet would lead you to believe.
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