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Paul,
I had a nick in my rear prop earlier this year and since one of my rear cowl fasteners was also missing, I theorized that it departed in flight and went into the rear prop.
My nick was much smaller than your's - perhaps 1/8" x 1/8". Because it was so well defined - with straight edges, it was pretty clear that a rock was not the likely cause.
The prop had to be removed and sent to the prop shop. In my case the damage was small enough that the nick could be filed out. There are rules the prop shops abide by, and the dimensions of the nick dictate whether the prop can be repaired.
Remember, any nut or bolt that falls off is going to go into that rear prop.
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