What twist rate is Hornady suggesting for the factory 212 ELDX load?

The SAAMI spec states a 8,5 twist but that is optional. I suspect that would work for the 212 ELD-X since both the cartridge and the bullet are Hornady designs.

They shoot fine in my 10 twist 300 wsm.

Bb

I'd run a 1-10

Got this from Hornady,

"Anything 1:10” twist or faster will work fine. If you are shooting past 1500 you will see some benefits to the faster twists. We spec’d the cartridge at a 1:8.5” twist as it is optimum for all types of shooting to include the very long range stuff."

I see where Bergara will offer 300 PRC rifles in 2019. They are going with a faster 1:8 twist on their rifles.

A 300 Win. Mag. will grab the brass ring.
It will get the job done with a smile.

Hint!

Just my 2 cents.

Have a good day,