OK, so I know some people have a 7mm supermag that shoots 1/2" all day long. But overall, smaller calibers shoot better. Perhaps it's shooter related but likely its just a bit harder to get bedding, scope mounting, bolt truing, brass hammering all quite as spot on once you're up over 50 or 60 grains.
Try the max load numbers on a 6.5 of some sort eg Creedmore or 6.5x55 SKAN (stoked up 21st century specs for the 6.5x55SE cartridge dimensions) and perhaps you'll get good enough terminal ballistics at 600m but with better chance of building a durable tack driver. Also, if you can go down to a 3006 or 308 length action you've saved some weight you can put back into mounts or barrel length. Each bullet weighs less if its 140 gr instead of 168 (or 200 if you go to .30 cal).
Also, I've seen two swaro Z5 3.5-18 with wobbly elevation turrets (different types).
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