the chargemaster is the best thing for reloading since sliced bread... does that make sense???
I have a 12" flourescent above my bench, maybe 24-30" above the chargemaster, which is on 90% of the time I use it. Does it have an effect; I have no idea what it would do, if anything. I just calibrate it each use and go from there.
The straw is a good improvement. It keeps the machine from over-dispensing your charge. I just cut a 1/2" to 1" piece of red straw and slid it into the tube, and over-charges stopped happening 95% of the time, where I used to have about 50%overcharge by .1 or .2grain (the scale tells you when its over). I still keep a very small scoop next to the machine for the rare overcharge.
What I do is dispense one charge while seating a bullet over the previous charge. There is only one charged cartridge at any time, which is good in case of an accidental bump or whatever mishap might occur. Just don't bottom out the press during the last 1/2 grain of dispensing.
When you finish loading, empty your chargemaster into a shallow bowl and return it to the powder can, then close the drain spout. Before loading powder, make sure the drain spout is closed every time. After draining the hopper, I usually set my dispensing to 99 grains and about 30 grains comes out of the tube, just to make sure the entire system is empty.
That's enough for now. Enjoy your chargemaster.