Any problem with leaving primed cases is a closed box for several weeks before charging with powder and seating bullets?

Any chance it will affect primer performance?

I doubt it being they are packaged in cardboard.

No problem leaving them for years, if the primers are not subjected to moisture or intense heat. I often have primed cases sit for long periods of time with no degredation.

I have also had primers submersed for days in water that worked fine after a long drying period. That was twenty years ago or more, and the few remaining of that batch still work fine.

I am using World War II surplus 4831 that still gives the exact same balistics as it did when I bought it 30 years ago. Also 20-30 year old powders of a number of types -- flake, ball and extruded, single and double base, that have accumulated over the years. I have never seen a problem with any of them.

For practical purposes, these components last a lifetime if you take some care with their storage, and often even if you don't.

No problem at all, as long as the brass is kept in a cool, dry place.

Np problem at all.....

Standard procedure for me. Prime and store all empties until I have time to finish the job. All go bang.

since you can buy em primed, i doubt there's a real storage issue... see, teh primers are in cardboard too...
<grin>
jeffe