Now a new question--what does the color codes have to do with the loading ease of sabots. Which one would be a better fit with these bullets.
Very-very little association betwen sabot color and loading them. The common color for 44/50s is green. The common color for 45/50s is black.
For loading ease, purchase
MMP for 44/50s
Harvester for 45/50s
Still want another bullet option/easy loading?
Precision Bullet sells QTs and Dead Centers that are slightly undersized to aid in loading. I have lots of familiarity with their 40/50 blue sabot with their 40/50 bullet. I've found Cabelas Precision Extended Rangers (clone of Precision QTs) to average .3985 on my micrometer readings... nice easy loading from 180 grains to 250 grains.