If you can hit the fox with the more loopy trajectories then sure the others will work, they have plenty of energy. But in terms of a useful foxing round, for night work and so on, too much adjustment required. 243 with light bullets wins hands down.
In terms of inexperience, I'll admit to red deer, but on foxes and roe, sorry Vim, you're talking rubbish again.
Sorry to jump in Mr L but are saying the .260 is loopy ? On my findings a .260 will shoot a 120gr bullet Flatter than a .243 will shoot a 100gr bullet .
So therefore is it a better fox/deer rifle than the .243 ?