Dear Bob and Bill,
the names of the regiments at the time had nothing to do with the place they were recruited from and were quartered at. This particular regiment dates back to the times of Peter the Great being raised in 1708. The regiment had silver trumphets as a special distinction for the participation in capture of Berlin in 1760. It also took part in the war of 1799 for the most part under the name of Povalo-Shveikovski. As an aside note, as Ilia Ulianiv notes in 1812 it had the Brown Bess muskets.
The correct name is Muromski, originating from the town of Murom. Bill, the form "Murom Infantry Regiment" is consistent with your policy of naming the regiments. The town of Murmansk wouldn't be founded for another hundrad years.
The Wikipedia page about the regiment (in Russian)
https://ru.wikipedia.org/wiki/%D0%9C%D1 ... 0%BB%D0%BAAbout Murom
https://en.wikipedia.org/wiki/MuromAbout Murmansk
https://en.wikipedia.org/wiki/MurmanskHope it helps. Helga! Drinks to camrades over here

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Leib-Guard Cuirassiers Regiment's
General-Fieldmareshal Count Anton Kosyanenko
Commanding Astrakhan grenadiers regiment
2nd Grenadiers Division, Russian Contingent