I've had a few Mis-Fires with it when I Hunted in the Rain and Heavy Wet Snow, no matter how hard I tried to keep the Cap dry it still happened and one time on a good Buck. I figured the 209 Mag Spark System would hold up to any snow and rain as caps won't, I have yet to try it so I'll let everyone know when I do. I just recently see where they make a "Cap Protector" it fit's over the No11 Cap to protect it from the elements.