Very interesting post again, Robin. Running boar has long fascinated me but my experience extends only to staring wide eyed at the Walthers, Original etc Moving Target rifles in John Walters "The Airgun Book". They are look superb, the Walther in particular.

In a later version of the book a FWB C60 moving target is depicted with a scope held by a strange, large diameter front mount which sits well forward and clasps the bell of the scope. The rear mount looks pretty standard, if high, and clasps the scope tube in front of the turrets. BOTH MOUNTS ARE FIXED TO THE BARREL.

The loading latch on this gun looks shorter than that on a standard 600, though.