Anybody Try IMR Enduron 4166?

[OneEyeDog]

I just shot 4166 out of my Athris 22" upper and it did .5moa 5 shots all touching in a horizontal string @ 100yds, 10 mph wind and 38 degrees fht. I used 120 Nosler 120 BT over 25 Grains of 4166 no signs of primer issue . I didn't use a chronograph and the round did Not cycle. I'm gonna try upping the wht to 25.5 - 26 gr. and see what happens. Also a can try adj gas port. Let you know