Modern mono and bonded premium projectiles have changed the playing field.
In the past slow and heavy was considered the way for close quarters due to the fragile nature of projectiles, slower impact velocity meant less likelihood of bullet failure, meat damage and wounding due to poor penetration.
Larger bore also meant that expansion was less of a concern as big bullets make big holes!
I suspect this is largely why the .270 got its reputation as a wounder, poor bullet construction.
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