The best single set for the replica cap and ball revolver is the Brownell's Colt SA set. It may not have a bit to perfectly fit one or two of the Italian screw slots, but should work for almost everything. I bought the 22 bit Starter Super Set, then added more bits as I needed them for guns other than the cap and ball guns. Never have had a problem with the bits fitting the slots due to the long side being rounded too far down.
I also have a Chapman set, and yes, I've broken bits on frozen screws that had to be soaked or even drilled out on guns I've restored. Breaking a Chapman bit is not necessarily a bad thing; it tells me to get out the Kroil or ATF/acetone mixture. And they're cheap.
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