My problem is the RIM needs to be trimmed. the case is OK, so the buster seems to handle a bulge. My rims seem too large.
I ran into that problem years ago. For whatever reason, the rim diameter would grow over time and the cases would no longer fit into the shell holder. In those days before the internet, that problem was addressed in the gun magazines. The "cure" other than throwing that brass away was to use the sizing die (most were steel, not carbide in those days), to reduce the rim diameter by pushing the offending brass into the die backwards. It could be done by screwing the sizing die into the single-stage press upside down and using a large diameter pin punch to tap the casing into the die or one could make a tool such as this which was turned to the same dimentions as a standard shell holder on a lathe:
The tool would snap into the ram on the press and the brass case would be placed on top of the "stem" of the tool and carefully pushed up into the mouth of the sizing die...it did not take much.
Here is a picture of the tool mounted in a single-stage press:
I didn't have an empty .45ACP case to put on the tool for the picture, but I am sure you get the idea.
In short, in the "old days" when the 1911 and the .45 ACP were king, that was the accepted solution to the then well-known problem with the rims getting to large in diameter. Nowadays, those commonmaladiess and fixes seem to need be relearned all over again.
Note: As I remember, I used O-1 Drill Rod for the tool and hardened, drew it to stand up to the work it was to perform...mild steel as I remember, would not hold-up.