Those on your list I would go with 6.5 CM or possibly the 6.5 PRC if your wanting something for hunting and range play. 6.5 CM slightly less powder, lose a little in performance but not much, tons of data and loads already out there. 6.5cm is fun to shoot and easy on recoil.
Like someone said above you kind of have 2 different types of rounds here, large over bore rounds and then regular hi performance type round. Both the 26 Nosler and 6.5-300 are not going to be fun to shoot at the range for long periods due to recoil In my opinion, I’ve went through this my self (not with those calibers). They are also going to burn up barrels pretty fast and cost quite a bit more to reload for due to powder. While the ballistics are good you already have a round that could compete with them ballistically if setup correctly in the 300wm.
Quite a bit of data for 6.5prc now too. Still fun to shoot but little more recoil compared to 6.5cm. Probably a little less barrel life than 6.5cm but I don’t have any hard evidence on that myself and really only matters if you shoot a lot, like 500+ rounds a year, which I would expect the PRC to get around 2000 rounds on barrel. The 6.5 cm can go to 3000 rounds at least. So unless you shoot over 500 or so rounds a year you are going to get several years out of the barrel.
Might consider something in 6mm range as well. I really like 6 dasher, don’t have one my self but was torn between it and 22 cm. Only went with the 22 cm to be different because my friend has 6 dasher and I help him reload and shoot with him a lot. Great barrel life, better ballistics than 6.5 cm (less drop and about the same on wind drift) when running the 105 and 109 bullets with high bc’s. Slightly less energy at target but not too much. Still effective to 500-600 yard for whitetail type game. Most people don’t need to be shooting past those ranges anyways at game in my opinion, probably about the distance I should ethically shoot as well, although I have taken game beyond that. Easily target shoot to 1200 yards, only downside is spotting the impacts with it at that range are slightly difficulty with 6mm round.