The pervert part is in the metric??? At least from the reading... So the .338 probably won't scratch the itch. May have to wait until he gets back from the pharmacy to find out.
He could get his Marky Mark on and paper patch the 8mm's to fit to .338... soaked in cabbage juice to maintain the required German interesting factor. Please keep in mind... only trying help here. Win Win, really. Slmbo sells a barrel, 8mm itch scratched, and, well, it would certainly be interesting!
R.