Reliable - yes, within the ability of man to make anything completely reliable.
Accurate - yes, within the ability of man to make anything accurate.
With that said, mine has had everything from blackpowder "cowboy" loads to Garrett/Buffalo Bore stuff thru it. But, I've put well over 1000 rounds of handloaded, hardcast stuff thru it. Nothing has broke, yet, except me shooting the Garrett/Buffalo Bore stuff. That stuff is definitely for limited use only when you get to be my age.
Now I did change three things. One piece firing pin, Bear Proof ejector, and a Happy Trigger. None of the original parts broke, but I found these three things, especially the trigger made it run smoother.
Oh, I did remove that stupid safety button. Damned lawyers.