Yes, you can. But how accurate it will be depends on the design and the gun and load. If you go for moderate to slow speeds it tends to work better than if you push them to the max. IME the faster you push them, the more problems you have. Given a boolit that fits the gun to start with and a gas check shank that isn't boogered up (has a smooth and even circumference) they often they will shoot rather well, especially at short range.
I'm sure Ken will add the relevant posts as he can as there is a lot of discussion on this already and on how a GC functions. But, that paragraph will at least get it started.