I am dubious about the .30-30. Over here flat nosed .30-30 bullets have always been hard to obtain. Impossible now that you can only use FMJ for target shooting. So owners have always been inclined to reload spitzers and single shoot them on the ranges. Its about the only way you can have a .30-30 over here now because they are virtually never used for hunting… I don’t know anyone who would reload a .Kynoch case in the last twenty years.
The case appears to have a resizing line around it near the “K” written on it and it is dubiously shiny for a factory Kynoch case. they were always dull even when new.
Adendum: .30-30 shooting is growing in interest over here because the CAS shooting is growing but the guys are shooting milspec spitzers for exactly the reasons I gave before I doubt that the round pictured would cycle through a .30-30 But Britain had .30-30s possibly from WW1 to certainly WW2 as an auxillary calibre. The only application I have Knowledge about directly from personal knowledge is them being issued to train drivers in WW2 but TonyE and I have discussed the possibility that I have seen an example with WW1 markings, but its nebulous.