Edelweiss,

I would think that leaving a BP firearm loaded for two weeks would not be detrimental to the chambers/bore/

In my instance, with my Ruger Old Armey, I left it loaded for probably three years (1980 -1983) while living in Columbia, SC, a very humid locartion.

The pistol had been well cleaned and lubricated prior to loading though I may have fired a cap on each chamber prior to loading as I had learned to do for initial loadings to insure the nipple and chamber are clear. If so perhaps the primers caused the chamber pitting issue.

Daryl_S has suggested also that the powder may have contributed. I don't remember what powder I used.

Again though, for what you are looking to do you should be fine.

Vlad