Well my understanding is that rifled muskets were in use at least since the mid 17th century in siege warfare. There were also rifled wall guns in use at that time.
As well as researching technologies, development should also depend on creating the state apparatus to handle a modern society. For instance, capitalism depends on laws relating to property, contracts, and corporations, so developing a legal system should be part of it. The cost of this might be that in spite of your megalomaniacal aspirations you have to tone down your absolutism and concede some power to courts and parliament.
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