SR - 4756 is a single base powder , a real favorite of mine for years . The powder line " Nobel Sport - Vectan " are mostly single based as well . The ba-9 is about like Unique so I would think that ba 7.5 would be a real close equivalent to SR-4756 . I have never tried any of their powders but I read good reviews . I might try it someday yet . Their powders are very popular in Europe .