I don't agree that match rifle barrels don't often have slight constriction at the muzzle. It's not caused by manufacture as much as inspection and gunsmith lapping from the larger end.
Before cutting the barrel, you should slug it with a lead slug to determine if it's uniform, or whether there may be a loose or tight spot near the proposed cut location. If there's a tight spot, cut it there. If it's tighter at the muzzle, leave it alone unless it doesn't shoot well.
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