African PG are tough!! Wildebeest and Zebra are really tough and hard to put down.Seem much much tougher than american game.

Heart lung shots are effective getting both lungs but shooting for a spot on the shoulder broadside,between both angling or at the off shoulder seems a better shot getting lungs/pulmonary vessels/shoulders unless facing anteriorly.

Robinson's book shows classical heart/lung on most broadside shots.I would tend to go more anteriorly toward the shoulder on a perfect broadside.

I would totally agree with Mike16Rigby, Marrakai, AllenDay, and others that the shoulder/between the shoulders,or the far shoulder is the broadside/angling shoot to go for.

Hit 'em critically and break'em down.Especially DG unless a CNS shot is required