Calling someone an expert marksman is like saying someone is an expert beginner.
The Army has three levels of proficiency. Marksman, Sharpshooter and Expert. The medal is for being an expert. I can’t tell what the bar says but it probably is for Rifle.
I have known a lot of soldiers who had the expert badge. I suspect it wasn’t that hard to earn but my Father was truly an expert marksman.
I believe I was the best all around shot in my gun club but Daddy could always beat me. When I was a kid, he would tap a nail into a tree and get back around 25 yards.
Using an old Remington model 513 Scoremaster .22, he would hit the nail every time, driving it into the tree. That is actually better than most rifles are capable of shooting, much less by a guy shooting off hand with iron sights.