Do you know more about that powder?
So it's called "ETR7" which stood for Environment: Target Rich, which was sold by a small company called Expansion Industries out of Lynchburg, VA for a couple years. They were a startup reloading company but moved after they messed up and couldn't deliver their reloads to people, too backlogged. I think they shut down and moved to Texas, changed their name.
It was advertised as being "like Titegroup" but it's a large round flake that is actually a bit milder than Titegroup. I've used middle of the road Titegroup loads and it'll feed unreliably. I think the Titegroup advice was so reloaders started with something that was safe and not get themselves killed, not necessarily like Titegroup for exact performance.
Sometimes the large flake doesn't drop consistently, and on a Lee auto-disk, when it messes up it's in the form of a light charge, something like 1/2 the intended volume. Now I'm using a Dillon 650 with the Dillon powder measure (slider bar design) and you bet I like to use the powder check die. It meters a little better, just sometimes low by 0.3 grains or so.
It's a bit gassier than Titegroup, I believe. I've loaded up some 147 grain subsonics suppressed, and while people love Titegroup for that, with ETR7 it's still a bit on the loud side with this stuff. Much louder than Remington factory 147 grain subsonics. Just wish I knew what they used.
Anyhow, wondering if I can save myself some trouble. I suspect that after I use this powder up I won't be able to get anymore so the only reason I think it might be worth it.... is because I have something like 6 pounds of this stuff. At least it was cheap and I can shoot guilt free.