It’s all about bullet length and rate of twist.
To have a heavier bullet it either needs to be longer or different ogive. The longer the bullet the greater the rate of twist needed to stabilize. Round nose bullets get around this by being heavier but not getting longer.
slickncghia wrote:deflection maybe probably.
RN Soft points can open up quicker at lower velocities depending on design with more frontal lead exposed.
For me the main reason as was mentioned earlier. Round nose means more weight for a given length which means more case capacity for powder when you start to get up to the really high bullet weights and then more velocity
only worth it for large game at short distances.
ie example with guess velocities.
Hornady 220gn .308 Round nose length = 1.283 in
Hornady 220gn .308 eld-x length = 1.63 in
Running both bullets out of a 30-06 you might get (guess) 150-300 ft/sec more out of the Round nose.
that is an extreme example and the velocity would quickly drop for longer range shots with the RN but for a charging buff at 25m the RN would be the better choice.