Don't be concerned that you only have VV powders.
After lots of experimentation with powder choices, I have found that N140 turned out to be the most accurate powder for my two latest .308s with 150, 155, 168, 175, 190 and 200 grain bullets. I have tried Sierra, Berger, and Nosler bullets.
Also, don't conclude anything before you shoot the particular bullet in your particular rifle. The bullet shape, especially how much of the bullet is actually touching the rifling, has a lot to do with how your particular rifle performs with that bullet. BC matters after the bullet is out of the barrel, but only if the rifle likes the bullet shape and weight to start with.
My two .308 rifles are both Savages - they shoot better than I can but they have preferences for bullets, even bullets with the same weights.
One Savage has its best overall average with 175 SMK bullets then with 200, 150 and 190 SMKs all averages for all loads shot for each weight are with N140 powder and are at or under 0.48 inches. The best load for the 175s is 0.295 inches at 100 yards.
The other Savage has its best overall average with 155 Bergers and then 155 Noslers followed by 175 Noslers followed by 150 and 190 SMKs - also all with N140 powder. However, all of its top 5 averages are under 0.456 inches with the best load a 0.296 with the 155 Bergers. This Savage actually shoots slightly better on average than the first one but not with the same bullets.
You will have to determine what your barrel shoots most accurately if you are looking for accuracy alone. However, from a long range shooting perspective, you will probably find that what works really well at 100 yards may work out to 300 yards but may not hold up when you move out to 600 yards and more.
In addition to finding out that technique is crucial when you shoot at longer ranges, you might find that there is a big trade off between initial shorter range accuracy and longer range stability with the added factor of being able to read the wind. BC helps but as Bart said, the bullet can't find its way back onto the target at longer ranges if it initially strays off the intended path.
Bart is a much better source of knowledge on the long range technique part of the equation than I will ever be.
After lots of experimentation with powder choices, I have found that N140 turned out to be the most accurate powder for my two latest .308s with 150, 155, 168, 175, 190 and 200 grain bullets. I have tried Sierra, Berger, and Nosler bullets.
Also, don't conclude anything before you shoot the particular bullet in your particular rifle. The bullet shape, especially how much of the bullet is actually touching the rifling, has a lot to do with how your particular rifle performs with that bullet. BC matters after the bullet is out of the barrel, but only if the rifle likes the bullet shape and weight to start with.
My two .308 rifles are both Savages - they shoot better than I can but they have preferences for bullets, even bullets with the same weights.
One Savage has its best overall average with 175 SMK bullets then with 200, 150 and 190 SMKs all averages for all loads shot for each weight are with N140 powder and are at or under 0.48 inches. The best load for the 175s is 0.295 inches at 100 yards.
The other Savage has its best overall average with 155 Bergers and then 155 Noslers followed by 175 Noslers followed by 150 and 190 SMKs - also all with N140 powder. However, all of its top 5 averages are under 0.456 inches with the best load a 0.296 with the 155 Bergers. This Savage actually shoots slightly better on average than the first one but not with the same bullets.
You will have to determine what your barrel shoots most accurately if you are looking for accuracy alone. However, from a long range shooting perspective, you will probably find that what works really well at 100 yards may work out to 300 yards but may not hold up when you move out to 600 yards and more.
In addition to finding out that technique is crucial when you shoot at longer ranges, you might find that there is a big trade off between initial shorter range accuracy and longer range stability with the added factor of being able to read the wind. BC helps but as Bart said, the bullet can't find its way back onto the target at longer ranges if it initially strays off the intended path.
Bart is a much better source of knowledge on the long range technique part of the equation than I will ever be.