That sounds more like a weak fireing pen. I use only hand loads, but have yet to seat a primer too far. A primer will only go as far as the pocket cut for it. The primer should be seated all the way. I dont see how a primer could be seated to far in. Not to say it was a defect, or crimped primer. If you feel it is the ammo, I would send it to remington. I would check out your gun too, dont want the same thing to happen agian.

As for remington ammo. before i started reloading, remington was all I would use, except in a 30-30. My 30-30 didnt like them. As for my 270, 308, 30-06, all of them loved remington ammo.