ORIGINAL: cayugad
The black sabot in my experience usually indicated a high pressure .451-.452 diameter sabot. ...........................
As for loading ease I think you find the make of the sabot a lot more important. Each sabot maker like Harvester and MMP have a different thickness in the petals of the sabot. This is why some of them even tho the same color, will load so different.
This is what the sabots are. MMP Sabots .451-.452 diameter bullets. color code---
blackManufactored by Muzzleload Magnum Products in Harrison, Arkansas.