I had a chronograph like that once. It was the first model green Chrony, about 25 years ago. I found then when you put a bullet right through the middle of it, it never reads high again.
John
My green Chrony has been gathering dust under my loading bench for almost 20 years now...........
The PACT is somewhere out in my dad's alfalfa field.
If they hadn't stopped making the metalized-paper screens for my Custom Chronograph, I'd still be using it.
Loved my M35. But when it became apparent Oehler wasn't going to be supporting them much longer, and prices for the Oehlers reached bodaciously ridiculous levels, I sold it and bought a CED M2, a new Leupy VX-II, and still had money left over......
Casey