Abilene,
I’ve got one of those. No help with the Magtech. I use arbor press, about 1/10 inch from bottom-out. No matter what I did, it wouldn’t go in all the way. Like you, I use an 1/2 inch deep well socket to get them out.
I’ve chambered the magtech empty cases in a modern shotgun. No problem. Sliding the empty cases in to my Parker and LeFever Damascus shotguns, that same 1/10 inch wouldn’t go. I’ve got all brass Winchester and UMC hulls. They fit my guns perfectly, no resizing.
I eventually got someone to run them on a lathe with a mandrel. I had one box done. Then the empty cases would fit in my Parker and Lefever shotguns. I lost two of the magtech cases, due to splitting, on the initial fire. Eventually, I’ll anneal them. All the other magtech let go.
Uriah