I just read the review that BCAll wrote, and what are the size holes? I often take my countersink and open up the holes for the 44-45 boolits. It helps the fillout a lot.
It almost seems like you would need about 3 different hole sizes to cover the different calibers from 22- 30,35- 45
Also, as I look at these I suspect that you can use the plate to hammer on, instead of using the hand cutter, since that was a big part of the earlier discussion.