I tumble 50 cases in a coffee can lined with foam. A few drops of a 50-50 mix of STP engine oil treatment and Hoppe's No. 9 around the foam. A very thin film of lube all over the outsides of cases. Got this recipie from Sierra Bullets' California plant.
Case headspace has about .001" spread. No shoulder dents going through several 50-round batches. Do one batch while another tumbles.
Case headspace has about .001" spread. No shoulder dents going through several 50-round batches. Do one batch while another tumbles.