Nothing particularly wrong with the .270, wouldn't be my choice for a target rifle though. I had a husqvarna lightweight re-barrelled from 30-06 to .270. It was the first rifle i could shoot under MOA with at 400 yards with. Sold it on to a mate for his father to use.
If i wanted a single, multi-purpose hunting / LR gong gun then i would probably look at the .284 Winchester over the 7mmRemMag. Efficient case design, good availability of top quality reloading components, excellent range of projectiles, still good past 1200m with less powder, less recoil and without the rimmed case... Whatever floats your boat though - all the calibres are a compromise in some way.
.223 will be ok to 600m, i hope it is a 1:9 twist or tighter so you can use the heavier projectiles but the lighter ones will still get there.
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