I've used unique in the 35 whelen and found it provided nice accurate and mild loads.

As to position sensitivity, it isn't unless you load way down to sub 10 gr and ~700 fps loads.

As an example of how consistant Unique can be, in my 350 rigby I found 14 gr of unique would drive a 200 gr cast ~1400 fps. The suprising part was a 10 shot string had an extreme spread of 10 fps for the velocity. The 50 yd group was ~1" for 10 shots.

I've used blue dot in the .308, and it is amazingly accurate and mild.