I have used Red Dot in .38 Spcl. while a bit sooty. It worked as well as any others I have used in the accuracy department. POI, and POA lined up out to 25 yards.
I love H335 for use in .223 Rem with 55 grain bullets. It gives great groups even with mixed head stamp brass.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.