If the injector is going click, click, click then the chances are excellent that it is working. By swapping the injectors all you are doing is ruling it out completely. If the misfire is bad enough the engine management system will shut off the injector to the offending hole.
Another thing that you can try is to take a test light and see if it flashes when put on the ground side of the coil. It is one way we would test the old coils back in the day when there was but one coil. You should have a constant 12 volts to one side and the other side should flash. Check it against a couple other cylinders to see what they are doing. You can buy a simple 12V test light at most any automotive store for cheap if you do not already own one. If you find that the other coils flash, flash, flash and the bad hole does nothing then you have a bad driver in the ECU and will need to go see the dealer for a new control unit.
If you are going to drive it in to the dealer I would pop the harness off of the injector and drive it in that way. You'll be down one cylinder but at least you will not have raw fuel dumping down into the cat.

I have a couple of bolt guns, Savage, FR-8 Spanish Mauser, and a No. 2A1 Indian Lee Enfield and then a couple of semi autos, M1A, FAL. Your Mauser, is it made by Mauser or somebody else? Tell me a little about it, barrel length finish, optics, stock, amount of use it's seen, etc?

Mark