Is it pure gypsum, or do you have OSB or chipboard mixed in?R Rullholk said:
At least when I've mounted steel studs (regular Lindab) with special screws intended for the purpose, you have to work at it for a little while before the screw has worked its way through the metal. And it depends on the screw being able to spin freely in the board. If you have a wooden board, the screw threads into the wood and is pressed with great force against the steel stud.
This "working" has the somewhat annoying consequence that the hole in the gypsum board can easily wear out to a slightly larger diameter than is suitable, so the screw head then sinks too far into the gypsum.