Yeah Selmer old buddy, I have... and it performs just as well as the best of them, in all 5 of my 260 barrels...for both accuracy and velocity....
funny I burn it in about everything except the 22.250....
it is a highly overlooked powder nowadays, but with these powder shortages, that is a good thing.. because a lot of guys will pass it by and it stays on the shelves longer....
its also a hell of a powder for the 223, using 70 and 75 grain bullets... but don't tell anyone that...