longcruise
70 Cal.
Another thing that seals a #11 nipple if there's no cap on it, is a simple 1/8" rubber "end plug" that you can buy packs of at automotive parts stores...usually used to seal off the end of an unused tube coming out of a carb, etc...they make a nice snug fit...come several in a blisterpac dirt cheap.
Ditto! I don't use them while actually hunting but when the cap is removed as in camp or in a vehicle I put one over the nipple to keep the powder moisture content stable. They are also great for cleaning. Just put one over the cap, fill the barrel with water and let it set for 15 or 20 minutes.
If I ever do get worried about moisture on my caps while hunting, these doo dads would be my solution too.