Hey Roy,
I'm with everyone else here. I don't mind changing dies on my metallic loading presses, but changing dies on a shotshell loader is a real pain.
Many years ago I bought a used MEC Sizemaster in 16 gauge and bought a die set to change it to 12 gauge. It took nearly an hour for me to change the parts out, and getting it adjusted took another hour. Once I had done it, I figured I could do it more quickly if I ever had to do it again since I now had this experience. A few years later I bought another used MEC Sizemaster in 12 gauge and thought I would change the first one back to 16 gauge so I would have one in 12 and another in 16 gauges. Remember I said earlier that I thought I should be able to change the die set back a little easier since I had done it before? Wrong! It seemed like I did not remember anything, and it took me even longer to change die sets the second time. I say all this to lend credence to the idea that buying complete machines for each gauge might be a lot easier and not too much more expensive than trying to repeatedly change die sets.
I have three Hornady/Pacific 366 progressive machines in 12, 16, and 20 gauges. In addition, I also have the two MEC Sizemasters in 12 and 16 gauges, and I have a MEC Jr. in 20 gauge. I mostly use the progressive machines, but when I have just a few special loads that I am experimenting with, I go to the single stage machines. I think the MEC machines are really good solid machines that will last a lifetime. On my Jr machine, I added the automatic primer drop option that comes as part of the Sizemaster machines. The automatic primer drop add on is a really nice feature and worth the dollars to me.
Best wishes,
Dave Wile