Bob, the Lee TC mold I have is the single grease groove and not the tumble lube design. I hesitate to use tumble lube on a bullet I load for the Luger as the nose of the Luger cartridge rides on the forward groove of the magazine as it moves upward and I'm concerned that the lube might not allow the bullet to slide as easily as the unlubed bullet. It may work fine but I haven't tried them for that reason.
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