7mm Practical aka 7mm-300wm!
Super easy to find brass and reload for (it's just a .300wm case necked down to 7mm, some guys change the shoulder angles but it's not required). It will give you comparable performance to the STW without absurd throat wear. Fantastic LR cartridge.
If you're building it in a LA, I would definitely shade towards the 7mm side as you may need to make some modifications to get the smaller 6.5s to feed reliably. And if you're dead set on a 6.5mm... Creedmoor or .260 Rem would be my votes.
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