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That's a qualitative assessment rather than a quantitative measurement, but it's certainly a "clue." Whether or not it makes a difference worth fretting over is a separate question.
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It's a clue that there's likely no problem. If the bullets were NOT fitting through then that could indicate a problem based on the rationale that they might be getting swaged down to smaller than groove diameter which might cause some issues.
But if he's going send the gun to Ruger to have them spec the chamber throats, he needs something more than "bullets pass through" or some inside diameter measurements made with calipers.
He could slug each throat and the bore and measure the slugs with calipers, or he could slug the bore and measure the throats with pin gauges. Sending it off based on inside diameter measurements made with calipers doesn't make sense--there's a reason they make pin gauges instead of just doing inside diameter measurements with calipers.