I know this is a shot in darkness that would make Buffalo Bill's basement in the Silence of the Lamb's basement look like a lamp store... But what can we expect from your standard chinaman powder supplier? Almost none of us have access to quantitative testing of raws from the East. I hope you can write a few words about the % concentration of powders from there..even though this may have little relevance for any individual case of dosing raws for a cycle.
I've read oxy and winny are easier and cheaper to synthesize...maybe allows for a higher average %?
Have you looked at the chemical structure of Oxymetholone and Stanozolol? They are quite different than many TT derivatives in that the former contains a cyclic ester and the latter a pyrole ring. These differences make them more DIFFICULT to produce from Progesterone than most other AAS.