When I started reloading I had the same issue, mine was not moisture related. When I was hand seating the primers I would crush them down as far as they would go creating a few failures here and there. I started to "feel" the primer seat and would stop squeezing. Might be even harder on a...
Easiest way to zero a scope...... get close enough (50 yds) and shoot at a target on a large piece of plywood. Hold steady and aim for the target. After you shoot, dial your scope to the impact (holding steady or on a lead sled). Move back to 100 yards and repeat. Did this with my creedmoor...