I have never hunted bear in 18, but I have been in that unit for recreation a fair amount.
If i were going in "bear hunting" and on a fact finding mission, I would go up Race Creek, just out of Riggins and head toward Cold Springs.
You will find lots of dry camp spots, lots of country to explore and in May those basins should have bear.
It is outstanding scenery and you will have a fine time on the Salmon side and/or the Hell's Canyon side.
