Does anyone know anything about this bullet I found in my garden?

When removing a large tree stump in my garden I found it in the soil. My house dates back to around 1930’s. Was just wondering if anyone could tell me a bit more about it.

Please find attached an image

 

Solid shot for 12 gauge shotguns? Greased grooves.

 

1" Nordenfelt gun, 7.25 ounces (0.206 kg) solid steel bullet with brass jacket

EDIT:
seemingly an early one from the pre-cordite era
British victorian era 1 inch nordenfelt and aiming projectiles