During wet weather, No. 11 caps don't always provide enough fire to consistently ignite the powder charge, especially if you are using pellets. The Ruger 77/50 209 Conversion Kit gives you the ability to fire those hotter 209 primers, virtually eliminating misfires and delayed ignitions. Click graphic above to access owner's manual.This kit converts your Ruger 77/50 to allow the use of 209 shotgun primers.