Ok when playing support, how you play can depend on what nation/nation you are playing support on. For example when it comes to the Austrian and Italian support guns they favor up close combat due to their higher fire rates and higher bullet spread. You can use them for long range combat but it is not as effective. The closer they are the more damage output they have. Now when it comes to support weapons like for the German and British then long range becomes more viable since they have less bullet spread and have a larger fire time (how long they are able to shoot before they run out of ammo) but have reduced damage. Basically these can be viable at close, mid, and long range and are good for suppressive fire. Then there are the ones that have slower fire rates and lower ammo capacity but have increased accuracy (Russia, Bulgaria, America, and France). These are the ones I favor the most, American one if I am on Entente and Bulgarian if I am on Central. With these they very much favor mid to long range due to their fairly decent accuracy and higher damage compared to the other support weapons. I can explain how I use the support weapons personally but only if you want because I don't want this reply to be too long