Yep...
My 26 Nosler Shilen SS barrel has about 500 rounds. It doesn't foul, was Dyna Bore Coated early on. Thru the Hawkeye, it does show some early throat erosion, blackness I can't get out, not nearly the "black top" road you see with advanced erosion. Compared to those, the throat is still pretty slick.
I'm guessing maybe a thousand rounds. It still shoots sub MOA and as long as it groups, I'll shoot it regardless what the Hawkeye shows.
I think my new favorite powder may be n-570, it had been US869 and WC872. I seem to get more speed from n-570 than the other two, which are virtual twins from my experience.
n-570 is just a lot more expensive, $50 a pound. Sometimes you find it in the $40+ range. You can get an 8# jug of WC872 for not a lot more than a pound of the Vihtavuori.
DF
