I did not realize your rifle was shooting #11 caps. Is it even recommended for pellets and #11 caps to be used in conjunction with each other? I personally would not shoot pellets and use a #11 cap as an ignition. I base this on shooting pellets one damp drizzle typeafternoon using Remington Kleenbore Primers in my Black Diamond XR. While the primers did set the pellets off, there was a little bit of, for better words, hesitation. I switched primers to the Winchester W209 and all of that went away. I would not have even thought of using a #11 cap under those circumstances.

The only way I would even consider pellets with a #11 cap is if I duplex loaded 5 grains of Goex 4f first. I would want that down in the breech so that the #11 spark would get positive ignition on the Goex which in turn should fire the pellets.

And you're right, it is a lot of fun to experiment.