Where did you hear this one? Can you verify or elaborate? Here I come up with a new favorite powder and its going to wear out my barrel?

I am no fan of Accurate #7 & 9 powders. Some years ago I tried them when other powders were in shortage. The inside of 200 first fired 41 Magnum cases looked mottled, like they had been momentarily molten, and were so rough that they would hang up in resizing and belling dies.

Neither am I a fan of Blue Dot. I found out the reason for the warning against the combination of Blue Dot with 125 grain 357 Magnums, about 20 years before the warning came out. I lost a good S&W 19 in less than 50 rounds of a starter load taken from Speer #9, circa 1975.