303 Mark 1?

This round has the headstamp K 1 and it is shown on page 11 of Temples 303 book as a Mark 1 Black powder, this round however has the larger domed Berdan primer ,so it looks more like a Mark 1 Cordite case , but ,note there is no letter C for Cordite in the headstamp, I have a couple of questions someone can hopefuly answer, this round is loaded with a sporting bullet ,nickel jacket and a large lead nose (there are no neck crimps), which usually indicates an overun of military cases, and then loaded as sporting,do we know what Mark this headstamp is for ? and was it manufactured by Kynoch ?,could it have been an Indian manufactured case ? Thanks Randy