.17 HM2
.17 HM2 is a rifle cartridge or ammunition model.
Also recorded as .17 Hornady Mach 2.
Overview
Rimfire cartridge.
In detail
It is associated with United States.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“.17 HM2”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2669878: .17 HM2
Consult the source