Temp stability depends on your parameters;
Person A told me it is stable as it held zero at 1,300 yards in a 40 degree temperature rise.
Person B told me it gave more velocity(quite a bit more) but wasn't as stable as H1000 and not stable enough for his purpose.
Person A holds the current 1,000 yard 10 shot group record while Person B was shooting softball size rocks at 1,800 yards in North Idaho where they can have a near 100 degree temp swing from summer to winter.
It is plenty stable for me and my purposes but as to the original question of stability in the 28 Nosler.....How far are you planning to shoot ?