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... a 270 with the heaviest premium bullets you can find ...
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Not a good idea, unless you test the ammunition before hand. (As should be done anyway.)
Many companies are loading 160 grain bullets in .270 Winchester ammo now. However, the rate of twist in most .270 barrels is not fast enough to handle the longer projectiles. (especially 150+ grain Barnes bullets) So, the whole purpose of having a "great" projectile is nullified by the fact that the rifle is now less accurate than a potato cannon.
150 grain ammo in the .270 - try it first.
160 grain ammo in the .270 - try it, but plan to be disappointed.
A properly placed bullet is all that is needed. Premium construction helps.