A friend of mine is a 6mm loonie. He also owns a Hawkeye borescope (with most 6mm's that's a handy tool to have). He's saying his 6mm CM is eroding the throat about as fast as the average 243 burning slow powder. He also claims his 243 AI's are much easier on throats than the 243's, 6mm Rem, 6mm CM's.
