Can anyone identify this headstamp?

British. RL = Royal Laboratories. In Woolwich. Mark IV. A guess, but I suspect it is .45 Gardner/Gatling.
 
Got it in one. I googled it and this came up. For the Gardner Gatling and Nordenfeld guns.

nklsQba.jpg
 
Got it in one. I googled it and this came up. For the Gardner Gatling and Nordenfeld guns.

nklsQba.jpg

Yes that's what I got when I searched 45 galling. Couldn't figure out how to search for an arrow head looking mark on a head stamp lol. I have a couple other rounds I have to figure out too if anyone wants to help out.
 
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