I bought several boxes federal 1 oz 6 shot game loads. I have few boxes federal top gun 3/4 oz 7.5. The hulls looks like same hull. But i can load the game load hulls with universal clay claybuster 3/4 oz 6 shot. They look like they came from the factory. I have tried loading the top gun hulls same way. Final crimp makes small cracks by the crimp. Why does one look good and other one looks bad. What am i doing wrong?