This is a scenario which would work.
Take off from departure airfield A.
Fly 75nm north to airfield B and land.
Take off from airfield B and fly 150nm south overflying A and landing at C.
Return from C to A , 75nm.
There you have it 300nm xcq and never more than 75miles from home, ideal for all you scaredy cats and people who don't like flying out of the comfort zone. Not for real men like me and Shunter though.