I have been shooting 9 major for over 10 years, started when it was allowed by USPSA.
So I learned the hard way that 9 major and random range pick up brass do not play well together. I will use mixed brass for practice but with about a 145-150 pf.
For matches that require major I use known brass, Win, FC, RP, Blazer. Even this brass will bulge after a while. A roll sizer is the only way I have found to fix this.
I am very careful with my match brass, I will use once fired brass and only load it once before I use it for a big match.