I am soon to start loading .308 for my M1A and have a pound each of Varget and IMR4895 to experiment with. If Varget is going to be inconsistent from lot to lot that would be a deal breaker for me, consistancy is the name of the game! Once I go through these one pounders I was planning to buy a few 8# jugs so I guess I will keep that in mind with the Varget loads.
If you want to be really particular, you should ALWAYS check when switching lots for long range loads. It's best to buy a few jugs of the same lot and work up the load each time.