I have a Hornady bushmaster 450 die set that will not resize correctly. Factory loads work great, but reloads or factory brass reloads are too tight In my AR. Sometimes they simply jam. I measured them after running them through the resized and they are too big. I contacted Hornady and they basically felt like they figured it was me.
I bought them from a guy that was doing a build and switched to SOCOM 458, so they were never used and but not returnable.