There are different vintages of Chinese surplus out there. I had good luck with some 2011 dated stuff that was rumoured to be non-corrosive (then found to be corrosive by some) but it worked very well in my SVT's. Now all I have is some 60's Chinese that seems dirtier but will do very good groups with both SVT's and Mosins. Had a comparison test against some Soviet silver tip and the Chinese stuff beat it hands down (the soviet stuff had occasional click-bangs which this particular version is known for). The Chinese stuff was doing repeat one inch three shot zeroing groups in a PU. The numbers on the head are 61/67 while the evil Russianicon stuff was marked 188/71.

Ridolpho