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interestingly enough, if you ever get you hands on a commercial hunting rifle in .303 British that ISN'T a sporterized military rifle, you'll probably find the chamber nice and tight to case body specs.
The "generous" (aka "oversize") chamber is a military thing, like the oversize chambers in many machineguns, the intent is to be big enough that ammo will go in, ONCE even with "combat debris" (dirt, crud, etc) in the chamber.
Remember the priority is that ammo chamber, fire, and extract ONCE. Reloadability or life of fired cases is of no concern to the military.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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