well for my 2 cents worth, I'm a fan of speed and fragmentation in short action cartridges. so you have that covered with the 6.5 and 7m08 or 308 probably don't offer you anything more apart from ticking z government box.
You also stated factory ammo and copper. 3 ways to get s copper bullet to expand, velocity, diameter and bone/dense tissue.
at the ranges you talked about his puts you into long action or magnums.
So i would assume that limits you to caliber's like 7m RM, 30'06, 300 WM etc not that many if you want to get factory ammo.
looking at load data from Hornady with the copper 165gr 30cal even the 3006 barely gets you to 300 mtr. the 180gr does not improve the bc much for the speed loss if you want to stay in the 22-2400fps impact space.
or start reloading and step up the hole size to say a 35 Whelen with a 180-225 barnes bullet. Even if speed is down a bit the larger frontal area will do the business.
That will throw a 180gr at almost 2900 fps according to Hodgdons site.
so either 180 or 225 gr bullets are down to around 2000fps at 300mtr.
Z
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