With the tube kind on my Rock Crusher , From all the talk I only would have 20 - 30 primers in the tube at a time, with my face as far away as I could . It always tide up my press, about 1 - 10 primers wouldn't seat all the way and I would Redo - Redo - Redo, The "hand - primer " WOW , Slick, smooth , fast , Where have I been all these years?? To " ME " it doesn't look near as dangerous !!!