Look at the size of the target they used in the CBS reenactment.
Here's the view from the Sniper's Nest.
So, this guy just had to get it in the pink, and it was considered a hit.
And if you watch the video, you'll see that for the multiple marksman, it was very easy and smooth and rapid for them to recycle the bolt. But, we know those Carcanos are notorious for being rough and sticky.
It was NEVER that smooth and easy for Jesse Ventura. He had trouble getting it in. He was told to "slam it." And when he did, his comment was, "What a piece of shit."
Now, we know that Caracanos were typically hard to operate. Here is an article by the editor of GunsAmerica Paul Helsinki in which he reported his own experience that "the bolt was very hard to close."
Tony Heller also tested a standard, typical Carcano: