HKW found the 1808 regs for the Austrian Grenzer https://books.google.com/books/about/Exercier_Reglement_für_die_kaiserlich_k.html?hl=de&id=J9daAAAAcAAA it is essentially a cut down version version of the 1807 Exercier Reglent with most of the Linear drills cut out, but with a focus on columns. There are some interesting comments on skirmishing from p.112, but the bulk of that section is general principles rather than tactical details. It assumes the Grenzers already know quite a lot, as there is little about training unlike in the 1807 reg. Austria was always short of money, so there were few training camps - in contrast to the two- year Camp of Boulogne. However, there is a description of a camp in Germany in autumn 1797, which adds some useful tactical details https://books.google.com/books/about/Beschreibung_der_Exercier_Manövers_welc.html?id=wsFFAAAAcAAJ
