Cartridge info sought

[CINDERS]

Trying out how to do better pics with our new to me camera as my mobile phone is not that good at taking pictures of any clarity, so I gave it a go.
There is a Kynoch Mk VI Cordite Soft point (What year would this be app?)
" " " " Kynoch 303 215 RN is this civilian manufacture what date app.
As usual all replies are greatly appreciated by me I will get the hang of the camera.

Information

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