Hey drobs, appreciate your effort. Today I've ordered this:
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It's the only caps available now in my country, it will be delivered from other city maybe next week. Made in Czech Republic, I'll pay around $8 for pack of 100, I think that's cheap. Black powder will come together with caps. I can't buy balls, none available, so I'll order some cheap balls from France soon, together with wads and cleaning set - I have yet to decide which set (which brand and from which shop, I'll leave it for the weekend).
I asked sellers about Remington No.10 caps - no luck, I can't get them. Maybe in the future. I will order some other caps too, from France, probably RWS 1075, so that I can compare them with these Czech caps.
You wrote "A too tall cap could hit the recoil shield and detonate when the cylinder is turned" - but if the cap is pushed all the way down, than - whether the cap is shorter or longer - that shouldn't happen (cap detonating while cylinder turning) - right?