Shoulder holster for big little pistol?

[BuckRimfire]

Will a Bianchi X-15 XL size holster handle a 10" MkII? Wondering if I could carry these discreetly under a coat.

https://www.rugerforum.com/threads/mkii-picture-thread.302800/#post-3027114

 

[Busterswoodshop]

I have carried a MKII with the 10" barrel in a Bianchi X15 extra large for more than 30 years.
It's a little worn , but still works just fine.
In my opinion , the Bianchi x15 is the most comfortable shoulder holster I have ever worn.