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Full metal jacket bullets are strictly a target shooting round since they don't expand upon impact and tend to pass through soft tissue leaving only a small puncture wound and minimal cavitation. Therefore they are illegal for hunting and self defense because they result in game being injured and running away. Hollow points and other types of expanding bullets transfer a greater about of energy to their target thus taking down and killing the animal (or person) much more efficiently.
As for the type of gun, well that's where needing calipers to measure the diameter of the bullet comes into play. It could have been from a .30 caliber carbine rifle or a .380 caliber hand gun, it's just too hard to tell based on the photo above.