Great rifles, indeed. But I really think they are too well made, with tight tolerances. Consider mud or sand, or even the freezing Russianfront.
When I shoot my K31 every now and then a clean round needs some encouragement to be fully chambered and the action perfectly closed.
Factory ammo would prevent this side of the issue, but the “real world” would add soil, grit, mud, ice.
And prevent the high standards of maintenance the Swisssoldiers are trained to apply to they rifles.
I think that rifle could have caused headaches. Maybe even not. Just my thoughts.