Sounds like a common chronograph problem. The screens just missed "seeing" the bullet pass both eyes. Not a problem with your machine as all units miss one now and then. I get an error on an Oehler 35p with 3 screens once in a while. Nice thing about it though is if the velocity isn't very close between the 2nd and 3rd skyscreen, it'll blink the display indicating a read error. You're getting rather technical working up pistol loads in one-tenth grain increments aren't you? Half grain increments should be sufficient, yet that's the great fun of reloading as you can load what you want.
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