Whilst I work around that problem I'm skittering off in a different but related direction with another rifle. When I learned of the recent importation of empty primed .22LR brass again (from Armscor in the PI) I swooped in and ordered a shoebox full (literally) of the things. (Give me a break. It seemed like a good idea at the time. At least Sailor Jerry sitting on my shoulder told me it was...) At $.02 apiece + the cost of a pinch of powder + the free scrap lead, it's still in the realm of Determined Digital Dan's initial premise that kicked off this thread.
So your intent is to load your own .22 LR's - if so, what to use for priming compound?
When I was in college, Uberti had listed in their catalogs some replica Henrys in .44 rimfire, and Dad & I were trying to figure out how we'd load some. At some point the phrase "fulminate of mercury" came up and we decided discretion was the better part of valor...