gentleman, you will find a double rifle drilling in 9,3x74R any day here

the 450/400 NE makes it so special

just take a look on egun, here is another ferlach made drilling with two barrel sets

9,3x74R + 9,3x74R + 20/6

and

7x65R +20ga + 20ga( with hornet barrel insert)
https://www.egun.de/market/item.php?id=12891784