Shell casing help needed, and some other bits too

[Gridwalker306]

Went through my junk pouch from a hunt the other day and pulled these out. Came from a new spot where I found two North West Mounted Police buttons, I'm hoping these items are related. The two small ones are Eley 455, possibly used by the NWMP.

I can't find any info on this big shell. Has G.K. and a B at the bottom. Any thoughts??

Also this one is strange, there are letters on it but can't make it out.

The two items could be just junk, but given the location found I thought I'd check into them. One has a 16 on it, and the other has a 17.

 

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[vpnavy]

I searched Google and found...

.577/45 Martini Henry Rounds
George Kynoch "G.K"

​

 

[Gridwalker306]

I searched Google and found...

.577/45 Martini Henry Rounds
George Kynoch "G.K"

View attachment 1442859 View attachment 1442860 View attachment 1442861​

Thank you vpnavy, nice ID, now I know where to start!