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Hieroglyphic Inscriptions with historical-biographical content from the 18th dynasty are found continuously until the reign of Amenhotep III and thereafter frequently in the language of the Middle Kingdom, the "Classical Middle Egyptian". However, several grammatical surveys have brought forth noticeable deviations from this ideal, often motivated by the language progress. Furthermore, a recent larger-scale study recording not only the qualitative evidence, but also the quantitative side, did not exist. This contribution represents a pilot study on a sub-corpus of the inscriptions in question, which will serve as an initial reference study for future research on these texts. The corpus selected is the royal stelae up to and including Amenhotep III. The study is conducted on a set of grammatical key areas - verbal system, pronominal system, functional words, and in addition, outlines of the nouns, adjectives, numerals, phonology and lexicon. To conclude this study, an individual textual analysis with greater focus on parameters such as diachrony, register, genre and discourse type is added, as contrast to the general evidence.