My 10 ga. blocks are drops of 1" Starboard from my shop. Laid them out and bored on the drill press then a quick shot on the table router for the edges. Deep enough to hold filled hulls securely but easy to get out. Really good when I want to roll crimp, I can load a box then crimp all at the same time. Crimp tool doesn't cool between rounds, makes the crimping go faster.
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