you can also surface your shellholder measure the thickness with caliper or mic use a flat surface granite plate or glass, psa sandpaper 320 grit hold shellholder flat and start sanding. go slow because you can take .015 off quick but then you can adjust die to spec. That's how I do it to go deeper for bumping shoulders and you can shim under the case in the shellholder on ram if you only need a smidge
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