no one will give or share a working prototype of a .3 watt chip.

If I had some in hand  I could sell them for 1,000,000 usd

Frankly the .3 watt chip may be like  unobtainium.  The rarest of all elements a little humor for a sat afternoon. 

As of today no one has shown that they have a .5 watt chip maybe the sp30.1 from spondoolies can do it maybe not.