My main powder for rifles is WC 844 (similar to H335).
The supply of this stuff dried up early during the current shortage and until now has not been available.
Most powder pulled from existing 5.56 will be from ammo loaded with WC 844.
The stuff below looks to be WC 844 based on both the fact that it was pulled from 5.56 and the fact that the charge and velocity match up pretty good with Hodgdon data for H335.
https://americanreloading.com/reload...mil-8-lbs.html