.270 Caliber
(https://live.staticflickr.com/65535/52372339341_fe8a5db8d7_k.jpg) (https://flic.kr/p/2nMXVRX)20220919_113648 (https://flic.kr/p/2nMXVRX) by David Frank Allen (https://www.flickr.com/photos/183810052@N07/), on Flickr
Spartan ?
If it's a 270 then its a magic bullet ;-)
There is a 270 BT bullet shown, but your example looks more yellow in color.
https://frontierbullets.co.za/?product_cat=spartan-premium-hunter-bullets
Have not seen one in years