Mikilam,
I have a Krieghoff Classic Big 5. I have 7x65R, 9.3x74R and 470 barrel sets for the gun. I don't handload but have fired everything factory made threw the barrels.

The 7x65R and the 9.3x74R are adjustable. They both shoot almost any factory load well. The 7x65R needed some tweeking. After working up a load with Superior Ammo and a 1/4 turn on the regulating screws this set of barrels shoot like a bolt action rifle.
The 9.3x74R was less fussy it seemed to shoot everything well. It loves the loads made by Nosler. Again a 1/4 turn counter clock wise to spread them out a tad and voila it shoots perfectly. I really love the setup.

If I had to do it all over again I would buy the same gun in a minute.I'm still contemplating ordering shotgun barrels for it.