Was it the lack of full pressure factory ammo that deterred you from the 6.5 x 55?
308s are good. I'd trim down a regular tikka to 18 or 19inches myself with factory ammo.
A 243 might also suit your purposes. They are easier to shoot well for some and plenty enough out to 300m.
6.5 creedmore or 7mm08 have reasonable amount of factory ammo as well.
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