I have used Vibrating Samples Magnetometry (VSM) to check simple hysteresis curves and what not. I am unaware of this Epstein method but if you are just looking for simple magnetic information then it can likely be detected with VSM. The only caveat is that its not the most sensitive to "slightly" magnetic samples.... not sure if that applies. 

Thank you Mr. Amerling. I need total losses in W/kg to specify the grade of electrical steel according to EN10106 standard. i.e.  M270-50A, etc.

VSM method in the standard version is usually used for very small samples in a small gap of  electromagnet. And I'm not sure what VSM is useful here.

you can use ring sample methods to get total loss in w/cm3, and then you can change it to w/kg by density.