You have gotten some of the best advice throughout this thread that I have seen in a long time! Some of the posters have offered differences of opinion but they have done so in a very friendly manner by offering reasons to there different opinions. I commend ALL that have posted. You all are offering your knowledge to someone that is just starting out, and to some of us who have been at it awhile are picking up tidbits of info also (at least I did).
Your last question is a good observation. I don't see how people load at a match without having charge weight issues. One of the posters stated that he didnt use the plastic shroud with his RCBS Chargemaster. I DO use the shroud with mine after being shown one of the reasons that the shroud is on there. It keeps the wind from blowing on the scale (it does make a difference). Without the shroud in place, the weight will be plus or minus the specific charge weight that I'm looking for. I still check the weight about every 5th or 6th round to make sure that everything is where it needs to be.
There is alot of great information about reloading on this forum, just remember, if you run into something that you don't KNOW to be fact or if something that is suggested seems unsafe... just ask. I am sure that someone can give you an opinion on the issue.
I load at the range more than I don't. I do use an electronic scale at the range when I feel it's needed, and other than the bright sunlight giving me trouble, I have little problems. Most stuff is small grained stuff so I throw it dead in the middle of the window I choose to work out of everytime. The long grained stuff is a pain in the rear for sure, but with a little thought it can be overcame.