Corey, I had that cap problem on the Swamp Dragon in one range session.
No problems at all in the first session. Then on the second session I started having to strike the cap twice. Then I realized I had been using Remington caps with no problem, but the Winchester #11 Mags were giving me double strike problems. Went back to the Remingtons and had no more problems. The nipple on the Dragon is an Ampco bronze nipple. It seems to have a thicker taper than other #11 nipples and the slightly longer Winchester caps do not seat all the way down on it.