Best current powder for 6.5G?

[mdram]

On the shelf right next to the leprechaun beards and the unicorn farts...

I'd love to buy a keg of 8208 but it just isn't available. I have played with TAC and H335, both of which were good. Have a pound of A2520 to try. I have also found a pound of CFE 223, but its lack of temp stability is problematic. I really want to find a temp sable powder that gives good accuracy and high velocity with 123 grain bullets. 8208 fits the bill nicely if it ever shows up. In the meantime I am going to pick up a keg of TAC to use for Grendel and 223 target loads and stick with 335 for hunting if something better doesn't appear by next fall.

The popularity of AR Comp makes me think it should be on my list as well. Temp stable?

last 8lb drop of 8208 was 2 days ago at pv

edit:
this has a test for ar-comp temp stability in 223
https://www.wlcastleman.com/equip/shoot/t223/index.htm
AR-Comp: This newer propellant manufactured for Alliant by Eurenco Bofors AB in Sweden (RP-34TZ) has interesting temperature response properties and velocity consistency. The Eurenco Bofors powder catalog has temperature-velocity data showing that RP-34TZ has its fastest velocity at -29°C (-20°F) and slowest velocity at 52°C (126°F) with overall velocity variation being comparatively small to that of other powders across the temperature range. The powder had no significant changes in velocity between 66°F and 129°F in this study. The low standard deviation in velocity compared to most other powders offers the possibility that it could provide greater shot-to-shot consistency (accuracy) than Varget for prone shooting with service rifles between 300 and 600 yards.