Have not seen the FinnClassic but have owned several Valmets, one salesmans set with 4 barrel sets in one case. They all shot perfectly with almost any load. The shotgun barrels worked fine and I took lots of birds in Zimbabwe with them. Bought a set of the rubber inserts to use as barrel fillers and they did not affect the barrels at all. I see the Finn Classic has fillers/ribs and makes for a much nicer looking gun. All in all I am very favorably pleased with them.