Michelle O'Reilly and Nicola Parker wrote a great article on saturated sampling in grounded theory that I would strongly recommend for anyone interested in grounded theory (Unsatisfactory saturation: a critical exploration of the notion of saturated sample sizes in qualitative research; Qualitative Research 13(2) 190-197). https://www.researchgate.net/publication/257413822_Unsatisfactory_Saturation'_A_critical_exploration_of_the_notion_of_saturated_sample_sizes_in_qualitative_research.
As for applying grounded theory, Melissa Steyn and Don Foster employs grounded theory to identify race-relevant repertoires in "Repertoires of white talk: Resistant whiteness in post-apartheid South Africa" in Ethnic and Racial Studies 31(1) 25-51. (https://www.researchgate.net/publication/248995110_Repertoires_for_Talking_White_Resistant_Whiteness_in_Post-Apartheid_South_Africa.)
Hope this helps. If you interested in racism, I could suggest more readings. Otherwise, if you can specify your area of interest, I might know of other applications of grounded theory.
Article Unsatisfactory Saturation’: A critical exploration of the no...
Article Repertoires for Talking White: Resistant Whiteness in Post-A...