RE: T/C exp and Hornady exp question
It's my understanding that black sabots are used with .45 caliber bullets, ie. .451 or .452 diameter handgun bullets; and green sabots are used with .44 caliber bullets, ie. .429 diameter handgun bullets.
I personally prefer 260 grain .451 Nosler-Partition HG in a black sabot over 80 grains of 777, excellent accuracy and performance.