I have one with barrels in :

12-b/.223
12-b/7x65R
.30-06/.30-06
9.3x74R/9.3x74R
and
12-b/12-b

I think adding a .450/400 DR barrel set to it would be very cool.

Have also been intrigued in re-chambering the .30-06 barrels to .30 Super Flanged. Just because ...

Have never used the 7x65R, waiting for ammo. Covid-19 is delaying big time its shipment.

Never used the .30-06 barrels. For actual hunting the 9.3mm's do everything anyway.

This rifle is extremely accurate. If used as a single shot, I think it could be used similar to a bolt action. Need to do some long range testing on it.

Also verify the stability of the barrels and bullet impact. I had trouble in Namibia, where they shot widely apart??? Then on return to Australia, when tested, shot together again >??? !!!! User error in Namibia????