Like lost creek said it will work for neck sizing and I also have got good results with them and a generic 338 neck sizer. Many of my guns are wildcats so I use generic neck sizers in all calibers to save money. After a while though they will need to be full length sized again if your brass lasts that long. I am sure Shawn has full length dies to sell for this chambering. It would be a good idea to get full length dies made for your chambering if you plan on keeping and shooting it quite a bit.
BHP9, Shawn Carlock did not develop this cartridge. He started calling it the edge out of his shop. Many gunsmiths had been doing that one for a few years stamped 338-300 ultramag before Shawn started with it. When the 338 ultramag came out many gunsmiths quit fooling with it about the time Shawn started with it.