My experience with mono metal has been that the mono metal bullets need velocity to perform well and the performance window has been narrow. The best performance was near the max recommended design velocity, with velocities on the bottom end being inconsistent in there performance. (Expansion characteristics).
With your range limits, you should be OK if you can keep the velocity between 2500 and 3100 ft/sec for most mono metal bullets. Some custom bullets Like the Hammer have a better performance range of velocities and if you can get them they will work like conventional bullets.
Obviously, Bigger calibers would be best for wild boars and larger game, but if you can keep he velocity at or around 3000 ft/sec at POI all of them should perform well I would limit my self to no less that a 6.5 that met these requirements because of the running shot possibility's.
Just my opinion.
J E CUSTOM