Had some outstanding groups with Hornady 168HPBT and 44gr BLC2. This doesn't group as well in the summer.

BLC2 was origanally a military powder.
I have used it in a .308 and in .243 and had mixed results in the .243 where the .308 didnt matter.
Varget is suspose to be a better temperature sensitive powder.
Dave

Richj is on target here, I stumbled across this exact load about a year ago and it is one of the best 308 loads going. jbok

I use 44 gr of WC846 which in non-canister grade BLC-2 and love it. I shoot 150 gr Woodleigh and 168 gr Sierras to exactly the same POI in a bolt gun. Haven't seen variation in grouping from temp changes.

Varget shoots tighter groups in my gun all else equal but not enough to matter in the field.

H 4895, Varget, and Reloder 15 are designed for good low weather performance and will work within the pressure and cycling restrictions of your rifle.