Identifying the Correct Holster Frame Size for .454 Casull Revolvers

Question
I am trying to buy a holster for this gun and I have the one I won't but they are asking me Frame size. They list the following; Red Hawk, Black Hawk, K frame or L frame. Do you know which it is? Thank you for your help in advance.

Answer
http://en.wikipedia.org/wiki/.454_Casull

Not enough information, what model and barrel length.

I would say with that size round it is red hawk or black hawk size, but call the holster company and tell them which gun you have and they will tell you which holster fits it.