Those three measurements show the frame is within spec for that distance as it works out mathematically to be 0.3325 ± 0.0030. And it's good the distance is toward the long end of the spec.
That second test with just the barrel & bushing in the slide going on the frame is also good as it indicates the slide is not keeping the barrel from dropping down as far as it should when the barrel is linking down.
Made a quick review of what you've told us so far and glad I did, as this from your Post #6 finally sunk in:
When I try to pull the slide back, it moves about 1/4 inch or so, then stops. I have to push down on the barrel (chamber end) to get it to move the rest of the way.
That's an indication that the barrel bushing is interfering with the free movement of the barrel as the chamber end drops back down to the horizontal as the gun comes out of battery.
Carefully examine the barrel and bushing to see if there are any telltale wear patterns in their finishes showing contact that would cause the bushing to lever up the back end of the barrel.
Also check to see if the front flange of the bushing is parallel to the front of the slide when they're put together.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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