Well i finally got my reloading bench goig, and this is the first time i've used a powder thrower. I spent 4 hours with the thing and i couldn't throw within 3/4 grain. I tried to make sure i used the same stroke all the time, i tried the double bump, but i couldn't get it to stay close. Any ideas as to how to fix my problem? It's an RCBS uniflowpowder measure, and i'm using imr 4350.