I found these a couple weeks ago and ordered up some for .277 and .308. I don't know a thing about them other than the folks who answered the phone when I called were very friendly. The customer service person put me in touch with their R&D person when I had questions regarding their starting load data and he was quite friendly as well.

https://badlandsprecision.com

I can walk on water.......................but I do stagger a bit on alcohol.