I did a lot of research on BAT actions before using one on a long range 7 mag. The apparently rare instances of the action locking up on a grain of sand was attributed to very tight tolerances, not soft steel.
In any event, I have had no trouble what so ever with mine, but I also don't usually roll my rifle around in the dirt.
My Stiller Predator has given flawless service as well.
I had a rifle built on a trued 700 action once, and it was a fine shooting rifle that also never gave me any trouble. I looked again at a trued Remmy, but by time I had one done the way I wanted, it was within a couple hundred bucks of the Stiller, so I went with the full custom action.
BAT is in a different league.