i would use the mandrel firstGetting some new Lapua .308 Palma brass ready for it's first loading.
Camfer and debur the case mouth.
Set neck tension with mandrel.
Uniform primer pockets.
Next step is priming with 205Ms.
Whatta Hobby!
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I figured getting rid of the tiny ridge on the interior of the neck might help the mandrel do it's job.i would use the mandrel first
