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Granted, few 1911's are that tight, but when they are the barrel is very rigid, repeatably, while the rotating barrel has to have at least some rotational clearance.
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Why would this clearance have to exceed the tilting clearance at the muzzle end of the Browning design? Actually, a very slight rearward taper is all you need to accommodate a nil clearance in either case. That is the principle behind conlcal bushings used to accurize Berettas, whose barrels admittedly neither tilt nor rotate.