A missile smaller than RAM but with double the range? Really? Where is the evidence for any of these ranges? This reminds of the HQ-9 saga, where its range was progressively pushed on internet forums from 90km to 120km to 150km to 200km as the years went by.
Idon't know where HQ-10's 20km came from...
Well HQ-16 was cited from a credible magazine (naval shipborne weapons or something of the sort), so that's proof of a sort.
And HQ-9's maximum cited slant range of 200 km was from sinodefence.com (one usually does not accuse that website of overstating claims), and the 120 km range was from export HQ-9 ranges from brochures. Not sure HQ-9 was ever claimed with 90 or 150 km range.
But we don't know what kind of targets any of these missiles (including western SAMs and AAMs) are measured against. Maneuvering, speed, size, altitude etc are all factors unknown. Maybe 70km is for a medium altitude non maneuvering subsonic target and 50 km is against supersonic. But at the very least 70km is definitely a number we should keep in mind.