The ones I've got are Canadian-made IVI, which makes me think they're boxer-primed. I'll shoot a couple tomorrow and then I'll know.
sunray, clearly I'm not doing this out of necessity; I just have a natural desire to experiment. However if someone said "don't bother, blank cases aren't made to spec" then I'd give up the idea altogether.
teenahlake, I might just do that, thanks.