I think that I'm going to rethink my approach to snowy and wet woods hunting here in Oregon. A case that resists moisture getting to the lock and one that easily slides off intrigues me.
I just returned from 7 days of elk hunting in the snow and light rain in heavy timber.
I used a "cows knee" that I made, but realized that it was way too short to prevent moisture from running down to the frizzen/pan. One of my concerns with the cows knee that I used, was the ease and swiftness of removal for the immediate shot. I changed priming every hour, however, sometimes discovering a soggy mess. Anyway, I cut a 30" length of knee hide from the cow elk that we harvested and anticipate making a more effective lock cover with it. I had sealed all channels/gaps with a bear grease compound, but also discovered that either the ramrod or its channel had swelled, making it nearly impossible to remove. I must admit, though, that my rifle never failed to fire, when needed, throughout the entire trip.
A case that would slide off seems to answer my ramblings, as cited above.