Ares Defense mag allows for longer overall cartridge length..
I don't see them on the webpage unless I am missing them somehow? How long can you seat OAL?
I will also add that necking the 223 up to 6mm/ 25 cal/ and others as well as down to 20./17 cal has been going on for years so nothing new here really. I would hazard a guess that the 6mm/.223 AKA 6x45mm would be the most popular seeing as Hodgdon/Sierra/ Ramshot/Accurate Arms all have reloading data for it but nada for the 25/223.
But I can understand some folks affinity for the quarter bore