I was with the Canadian Team at Camp Perry last summer (coach). One of the issues a Coach worries about is if the ammo team members have is as good as it can be (does it work well in that rifle) and if it is at risk of being a disaster.
I am of the opinion that Vht N140 or N150 will make a better match load than Varget. The team shooting beside us at one point was the US Army Team, who have money and resources in depth. I got into a conversation with the Team captain about ammo (all their Team members shoot the same ammo) and he explained they decided to use Varget because it was reliable.
I see his point. Although N150 might make better ammo, if temperatures get real high (or lower than normal) N150 and most other powders - with RL15 being quite bad - will show much more increased or reduced velocity/pressure.
Varget means there is one less thing to go wrong. A good idea in the long run.
When I use a powder for a match load, I deliberately try it with an extra 0.5gr. If it shoots badly, I know my load is dangerous to rely on because on a hot day it will get me a low score. I also try it with 0.5 gr less, because first thing in the morning temperatures can be quite cold.
When I send my son off to compete in an important match, he has two extra boxes of ammo (with VHT N150) labeled COLD and HOT, in case a match happens to be unusually cold or hot weather. If I loaded his ammo with Varget, this would not be required. But the VHT N150 groups a bit better than Varget, so that is what we use.
If you use powders other than Varget you won't notice the temperature sensitivity issue unless your load is near the extreme of hot or mild.