No idea of the names. O_P asked their rep at SHOT.
https://www.m4carbine.net/showthread.php?t=53616&page=2
FMD knows one of their engineers or something, and he's talked to him numerous times about it and apparently gotten the same answer from him. You would have to ask him about those details.
I'm inclined to believe it as there is no product offering in the LE line with #4B or #1B. DocGKR has said that the #1B would probably be a very good load with optimal penetration and a lot more wound tracks due to #1B being about the ideal shotgun load and that #4B if loaded correctly could be as good or at least very near it.
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