I have seen some hideously damaged chronoscopes land on my work bench over the years, but this one is especially weird
The pellet enters through the back of the case, removes 2 surface mount transistors with surgical precision, then disappears.
Picture link
Usually when they go in through the back it is total destruction, delaminated PCB's, chips removed along with every connected track.
I thought maybe it had gone up the back of the board and got them with a shock wave, but there is no mark on the back.
New case, two transistors and it calibrates fine and dandy.
I don't know how he did it, but I have to say I am impressed