Okay, heres the results of an evening meticulously loading and measuring.
First off, to answer Ed. Average wall thickness for three cases is .016 at the mouth and .021 where the heal of the 250gr FTX is located.
Edit: That was measured without the benefit of a case wall thickness specific tool. I just used one of my cheap calipers. If you simply use the math method of the case OD measured with the bullet seated using a high buck micrometer, minus the bullet OD, divided by 2, you get .0143 at the mouth and .01935 where the heal is located. I like the second method better. The brass was never fired, so there's no residue inside it and the mouths were deburred.
Good News, Bad News.
The good news is the bulge is not as bad as with the 200gr FTX, but a seated round in a case still does not plunk without resizing. Not by a long shot.
The 3 new, unfired, trimmed and sized .284 cases had average dimensions of:
With a bullet simply seated, they averaged this:
As could be expected, the the cases hung at the bulge where the bullet heal is located.
I resized in .001 steps, using the resizing die until they finally thunked without dragging:
The pulled bullet unfortunately, also got resized, but not as bad as the 200gr FTX:
So, if we don't want to sacrifice the bullet dimensions, we are back to reaming, either before or after resizing. I prefer after.
Odd to bed. 04:30 will come too soon.
Hoot