I recently shot in a Small Bore Prone State Championship. And it rained but we were shooting undercover. When it was dead still the bullets were unaffected by the rain .
If there are lightning strikes in the area, and you have to define “how close”, it would be prudent to pack up and go inside. I have been in locations where work activities ceased when lightning strikes got within a couple of miles.
As for shooting in the mud, that gets old quick.
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If I'm not shooting, I'm reloading.
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