....but noticed that the oil had a lot of metal shards in it.....
How big are these metal shards? Do they look like slivers? OR you talking metal powder?
Hard or soft? i.e. can you bend it or break it, or it will cut your finger.
What color? dark/black/silver/rusted?
And you have no other symptoms of something wrong with the motor?
Metal in the oil for an engine is never good. Most likely something fractured or sheared away under friction/pressure of the engine. Its possible that it wasn't critical and didn't do anymore damage as it made its way to the oil pan. Maybe the surface it sheared away from or the small part that fractured off from, has enough surface/strength left that it continue to function without getting worse, but its just as likely it won't. Unlikely, but possible, something fell in the motor during maintenance/repair or a non essential part corroded and flakes fell off it to give you the metal in the oil.
You have to clean and exam the shards and try to figure out what they might be.
Does the Hemi have a magnet in the pan? My NAG1 trans has a big magnet in the pan, I just changed the trans fluid, and I had a big shock when I found shards of metal in the bottom of the pan. I had some metallic powder as well, but that is normal for a automatic trans, the clutch material will wear and leave behind a small amount of metallic powder in the oil, usually clumping on the magnet like a goo. After cleaning the shards and examining them, as well as cleaning the pan magnet, I discoved the rather soft black shards were from the magnet that had an edge of it crumbling away, and NOT hard silver metal from the trans components, that was a relief.
Hopefully someone has some really productive suggestions, because I can't really think of what you can do, except hope for the best and be prepared that your engine may need rebuilt/replaced. For peace of mind, you could changed the oil again, very soon, like in a 100miles, and see if your getting more metal shards in the oil. One time incident, with no other symptoms, you're probably ok, if your motor keeps putting metal shards in the oil, you've got big problems that likely means you have to tear open the motor, or decide if you're just going to drive it till it quits and replace the motor then.