Went to the range earlier in the week to shoot my muzzle loader a couple of times. Guy at the bench next to me was banging away with an MSR that, looking at the ejected brass, looked to be chambered in .22 WMR. As I set up, I realized I had forgotten my percussion caps. Sitting there for a moment before packing up, I wondered how similar the priming compound is for modern rimfire cartridges to the modern percussion caps (#10 or #11). Any thoughts? Just wondering out of curiosity. Pulling the head on a couple of .22s to have as insurance against the next snafu isn't really a good option.