Nothing new in that.

It is why rifle actions are designed to be stronger than your typical game-gun.

Just noting that a week's active shooting by an avid bird-shooter of that era would put as many cartridges through a gun as an elephant shooter might use in a lifetime.. The makers were well aware of the issues.

It'd be interesting to read some accounts of the culls. In this context, it would give us some idea of rates of fire required.