https://www.gunwerks.com/blogs/podcast/is-the-new-6-5-prc-here-to-stay

Good listen from folks at Gunwerks. Basically, the 6.5PRC is the 6.5-284, but in a short action, and provides standardized, commercial ammo that the 6.5-284 was unable to standardize enough for attorneys to sign off for mass production.