Yellow Tip 50cal identification help

[rangerstx4]

My grandpa was a rock hound that spent a lot of time in the Southwest. I got an old wooden box of oddball cartridges from him a while back. A lot of 43 head stamped, spent 50 cal cases. Guessing he came across an old gunnery range.

One had this yellow tipped round that's obviously been fired. It's got a hole in the back of it. Google gives results from Dominican to HE. Anyone have some insight?

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[DizzyJ]

No idea but that's a cool find!

 

[Mooseman]

Yellow tip was a spotter round ! It was used with the 106 recoiless rifle as an aiming device. It traces then puff smoke where it hits

 

[Mooseman]

 

[DizzyJ]

Cool video!

 

[Tankjr]

If the tip is hollow looking, spotter.
Didn't know you could shoot the short
spotter rounds in .50 rifles.