I had the same problem. I use the black plastic, reduced load cartridges.
I made a jig to hold the plastic cartridges in place on my drill press. Then I filed a metal cartridge down until it was short enough to let the breach close. Then I chucked up a router bit in the drill press and used the metal cartridge to set the depth of cut nuts on the drill press. After that, you just run all your plastic cartridges through the drill press. Check your length occasionally to make sure nothing has wandered...
Gary Van Kauwenbergh
Co G, 114th ILL Vol Inf
# 10143
"Alle Kunst ist umsonst Wenn ein Engel in das Zündloch prunst."
(In vain the skill and arts of man, When an angel pisses the priming pan.)
Field Marshal Gebhard L. von Blücher
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