Not much help but I would contact Galco to check. My 7.5" BFR is slightly larger than my 7.5" SBH. I made a holster for the BFR and wet molded it to the gun. When I put the SBH in it there is some wiggle room. Not a lot but enough that I won't use it for the SBH. The same holster would have worked fine for the SBH if it had been wet molded to it instead.
Experience is the best teacher, hunger good sauce.
Osborne Russell Journal of a Trapper