JDW, I also find that the old hand cranked roll crimper low tech approach is efficient and more than satisfactory for my needs with a bonus of minimal storage space. I have them in all gauges but use them primarily in .410, 20 and 16. In the past, I have loaded 16 for snipe at the rate of about a box an hour as I weigh each charge and load. I don't need as many shells for woodcock or turkey. I have yet to have the courage to mount the crimper in the horizontal as you do, but mount it vertically on a clamped board with the crimper head on top. Gil
