If you are going to measure your powder, why not make a dipper the proper size? Then you do not have to go through all the hassle of weighing your charges and reset them every time. Just make one for each cartridge/load. If it is a straight walled case, use as is. If it is a bottle necked case cut off at the shoulder, but if that is not big enough, go to the next bigger cartridge and cut down as far as needed, such as a 300 Win magnum for a 30-06 or a 30-06 for a 308 etc. Solder on a handle and drill and tap the head through the primer hole for a 1/4 X 28 screw for powder adjustments (bigger diameter screw for the big boys). Once you get the load you want with the powder you are going to use, lock the screw down with a jam nut and you are set to go. As with any powder measuring device, technique has to be the same from one throw to the next. Such as dip, tap on table, strike off excess, dump and tap. Viola, a poor mans' measure.
Good Luck and Good Shooting