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There is a reason for tight chambers. When a gun maker buys/makes a chambering reamer, he gets one on the outer edge of the specs for that cartridge. When the reamer gets dull, the tool room sharpens it, removing some metal. That goes on until the reamer is cutting chambers on the small edge of the spec. But a maker who wants to save a buck might go down a bit more before tossing that expensive reamer.
The chamber throat is cut with the same reamer as the body of the chamber, so the above applies to that also.
Meanwhile, the ammo maker and makers of loading dies are also using reamers on their dies, and buying large ones to turn into small ones the same way as the gun or barrel maker. So if the ammo maker uses a large reamer for his case forming die, his brass is a tad large, though in spec. But we are talking thousandths of an inch and mass production. So if a cartridge case that is a bit larger than it should be meets a chamber that is a bit smaller than it should be, there might be a seating problem.
Jim
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