Just re-reading a chapter in RA Rinkers 'Understanding Firearms Ballistics' and he talks about how the fuller a case is, the better and more consistently it will perform. this is because there is less trapped air/oxygen, and the propellant obviously has its own oxygen built into the granules, so excess will reduce efficiency.
I was then starting to think that maybe I shouldn't be using Varget for my .243, even though accuracy is great, as the case is hardly 2/3rds full. maybe I should be using a faster burning propellant that fills the case more??
anybody else an equally big loser to start thinking about these things?