This is what they sent me
“ The “unit” is not designed to work with any large primer tubes, because it will not process large primers. This is pointed out if you open up the web page for this product. The magnetic collars that fit over the primer tube and hold them to the “unit”, while tubes are being filled, are designed to fit over the Dillon Primer Tubes, but there’s a good chance the Hornady are the same outer diameter as Dillon. Please take a caliper and measure the tube diameter for us and we’ll then be able to confirm the Hornady will work. It’s also designed to count out 100 primers, so it’s important that the Hornady Primer Tubes are around 13” long, similar to the Dillon, RCBS, Lee, etc.”