There are no papers at all on the synthesis of XM-19 SS, using HIP. if someone can share his experience or suggest some articles regarding the Temp, and pressur, would be quite helpful.
if their is no literature available with XM-19 then try searching 6Mo, 904L. Stainless steel is readily Hipped and I'm sure 6Mo at least has been done. Try Bodycote: https://www.bodycote.com/hot-isostatic-pressing/ for information>