The red copper john nymph has been one of my top nymph patterns of all time. I have had more days of hooking up with big fish on this nymph than any others I can think of. The red copper john nymph is truly a versatile pattern and I would not even dream of going to the river without a supply of them.
The red copper john fly pattern is pretty amazing for finding fish. It seems rainbow trout are particularly fond of this red nymph, but on some days all trout species will find this thing irresistible.