i have the same one . i attached it to a 3/4''X2 1/2 '' piece of aluminum so i could bench mount it . i only roll for the LR 10 to keep bullets in placeMine is an old (1988) CH Tool and Die one, it’s a pretty basic design that can deliver consistent results.
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If you alter the shape of an electroplated bullet you just reduce the adhesion of the plating to the lead. This does not improve upon the already mediocre accuracy they produce.