my loads and miss fires

[Ol` Joe]

My first thought is tumbling media in the flash hole. I double check my brass after cleaning because of the amount I seem to find in mine. Make sure the flash hole is clear and the primer is fully seated. I only had one misfire in over thirty years of reloading and I never did figure out what went wrong with that round, but I suspect corncob was the culprit.
I can`t reply to the moisture as I`ve never seen that happen and I have had my ammo and myself soaked to the bone a few times.