I typically don't hunt in the shower, so it might be a moot point for me... I did leave mine out overnight on my covered patio while it was raining and high humidity... The next day I shot it just before noon with no problems.

As for ballistically speaking I do not have a chronograph, but will probaly buy one in the next couple of months... Accuracy does not seem to be different between the two powders and the velocity might be able to be increased by adding slightly more AP.

Again, to me it comes down to balancing pros and cons, I have heard very little wrong with AP (other than your shower test). The slight velocity difference does not seem to matter to me much either... the BIG advantage is not having to clean my gun out every couple of shots to ensure adequete accuracy like I have to with 777. I have shot at least ten rounds without cleaning with no affect on my accuracy with AP.

Again I think it comes down to poor advertising and distribution... I think AP would be the dominant powder if they were more readily available/advertised.