And another approach to range shooting that I've found to be convenient is to use 35mm film cannisters to hold pre-measured charges.
Pick up a few dozen empty 35mm film cannisters at any photo developing place for free, and in the controlled setting of your house or garage, pre-measure the charges into the film cannisters all at one setting before going to the range.
Then seal them up inside large, labeled ziploc bags...I usually keep a few bags prepared containing a few different charges (ie: 50,60,70grns) then store them inside a sealed GI ammo can.
For me, it's simpler, faster, safer...less things laid out on the bench, less things in the way, everything stays sealed until the moment you pop the lid off a cannister and pour the charge down the bore...