Wanted to share what i have learned with reloading 9mm with cast boolits the last year. I had no issues when i was casting with harder lead like ACCOWW but i am a cheap SOB and i have a ton of range scrap from a indoor range but is pretty soft around 10bhn. My issue was the case was swaging down the boolits below .356 some as far down as .353 and was causing tumbling and leading. I tryed to fix this with a 38 special Lyman M die. This helped but i still had swaging of the boolit to .355. Next i purchased a RCBS .358 neck expander. Loaded some up and pulled the boolits all mic .3568 on bottom driving band and top was .357 boolits started out as .358. Now time to hit the range and verify.