I've had feding problems before due to the magazine follower spring sliding forward (toward the muzzle end) in the magazine well (ADL and BDL types). Check the follower spring is toward the rear of the magazine well and applying pressure to the rear of the cartridge.
You would not believe how many times a customer has brought me a rifle that didn't feed properly and the only problem was................The magazine box was not in the rifle! A lot of times when a guy disassembles a Remington (Me Included) they forget to reinstall the magazine box. It will cause the problem you are having.
The follower trick Dave King posted about is also a VERY inportant cause of feeding problems.
Whatever it is, it HAS to be something simple. Take the stock off of your barreled action, check everything and put it together again. Let us know what you find.