Hi, German guns tend to be choked a bit tighter, but that's not cut in stone. The only real way to find out is to get a good bore gauge that you can measure the bore diameter, then what the choke diameter is. For example, if the bore diameter is .729 (12ga) and the diameter at the choke is .709 you have a constriction of .020 which would be Modified. Bore diameter will vary from gun to gun and if a O/U or SxS barrel to barrel. Choke will also vary like the bore diameter. So you really need to measure. I have guns (and choke tubes) that are marked Mod for instance, but really measure out at IC or IM depending. But, then to make sure what choke your throwing, you'll have to pattern the gun, which will take time and even then, the choke may vary from load to load. Just a matter of time and experimenting.
I can suggest a quality gauge, accurate and easy to use, not cheap, but it's a quality product:
http://www.theunloader.com/Good Luck!
Greg
