FallenHero That might be what your job demands but it is not true.
I have shot 303 Lee Enfield rounds with a DoM of 1917. Hundreds of rounds with not one mis-fire. Sure, it was fulminated mercury primers w/cordite propelant, both highly corrosive but it shot well in 1985.
Properly stored, modern smokeless powders are good for 100 years, the same holds true for primers. Both have a thin skin that prevents the absorbtion of moisture.
Powder should never be stored in one of those vacuumed food saver bags, because it will crush the powder prior to use. This will break the skin on the powder.
To keep any moisture from entering the rounds in my back packing carry weapon, in the event of a fall in cold water, a thin coating of clear nail polish covers the primer and the seam of bullet to brass case.
MrBond, Dillon is not cheap, just the best.
I remove the press from the bench when not in use. But, upon the recommendation of "The John Taffin" @ sixgunner.com, I bolted my bench to the wall and had no more flipped primers while reloading fast.
I have a 1"travel dial indicator and magnetic base. They were used to check powder levels while working the 650. Variations were incredably tight and were impacted more by the way the charge stacked than by the amount thrown. No wonder target freaks swear by them, not at them 😉
...Galvanized