John -- I think you are overlooking a potentially important point from the opening post, which I quoted in post #37:
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I first noticed that with all but one chamber I could drop my XTP bullets straight thru.
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If the bullets WON'T drop through one chamber, that chamber is different from the others. More important (perhaps), if a bullet won't drop through it, then a bullet when fired through that chamber throat will be squeezed down to the diameter of that throat. If that's smaller than the groove diameter of the barrel, then bullets fired from that chamber will be sort of rattling their way down the barrel.
According to SAAMI specs, the nominal bullet diameter for .327 Federal magnum is .313 inches. The nominal groove diameter of the barrel is .312 inches, which is smaller than the bullet, but the nominal diameter for chamber throats is .314 inches -- which is larger than the bullet.
The chamber throat isn't supposed to squeeze the bullets to smaller than the barrel grove diameter.