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As I understand it Bisley is the top, standard plough handle is the middle (found standard on the 4 5/8th and 5.5" SBH). Dragoon bottom is the plough handle with a square-backed trigger guard (found standard on the 7.5 and 10.5" SBH).
I'd also note the the 4 5/8" and 5.5" SBHs have the smaller sized XR3 regular blackhawk gripframe. I found these a little small for 44 so I put a full sized plough handle gripframe on my 4 5/8" SBH. Much better imo.