OP, the above are all good answers to your query.
The system you have is acceptable, especially for the pistol cartridges.
It's also fine for your 308Win, unless you're loading to precise recipes.
The powder throw will give you loads that are within +/- .2 grains as posted by OKayshooter, but if you're getting into precision shooting, then it's time for you to use the beam scale, provided with the kit, or get a digital scale, and hand weigh every individual charge, then hand pour it into your cases.
With most hunting rifles, 1/10 grain doesn't make much, if any difference to accuracy, unless you're shooting a small caliber bullet, such as the 223, in a small case, like the 223 Remington.
Most rifles, chambered for cartridges with case capacities similar to the 308 Win, don't show a lot of accuracy gains/losses, even with .2 grains +/-, until you get close to maximum pressures for a particular rifle.
Usually, an "accuracy node" for a primer/case/powder/bullet combination recipe is what you're looking for.
Once you've found that "accuracy node," nothing usually goes seriously wrong, unless you're close to maximum pressures.
+/- .2 grains will give you acceptable loads that will be consistently accurate for most "reasonable" hunting purposes.
1.5-2 inch groups are fine for shot out to 250yds on Deer size and larger game animals. Tighter groups are nice, but some rifles and some bullets just aren't capable of anything better.
You will also have to determine when it's time to clean copper jacket fouling from your barrel's bore. For most rifles, it's around 25 rounds. Some never seem to need it, but most do. This bit is off topic, but if you're new to the game, it's something you need to know when looking for accuracy issues.
