Re: StaBall 6.5:
Yes, I bought some, specifically for 7mm-08. I have not loaded any yet, but, my analyzing load data tells me it is even better suited for 7mm-08 than 6.5 Creed. It is far and away the highest fps of any other powder from Hodgdon/IMR/Winchester according to their data. Generally, 150 fps faster.
So, yes, you are on the right track. Reports I have read here indicate it delivers those velocities. I have no idea about the temp sensitivity, or lack thereof.
http://www.hodgdonreloading.com/data/rifle
Regarding light for caliber bullets, I bought a box of Barnes TTSX 120 grain bullets. The Hodgdon datacenter does not have data for those. Barnes data excludes Sta-Ball. Sta-Ball data shows 120 gr to 175 StaBall lists the fastest loads, including data for Barnes 150 grain TTX
I find data for Barnes copper bullets to be spotty, even from Barnes. Barnes data does not mention Sta-Ball.
Since StaBall is new, the only data for it is from the link above. The data not being available does not mean it would not be get satisfactory results. QuickLoad wouldn't help because they do not test list newer powders often.