So, I tried the little resize trick and here's how it worked out.
But first, I have two 50 tc Hawken barrels. I took an as cast maxi and tried both for fit. In one barrel the maxi didn't want to start. I pressed a bit and still no go. In the other barrel it slid in with just a bit of friction but stopped at the front band. This seemed like an ideal fit for the maxi in the second barrel.
Next I measured all three bands on a fresh maxi just to be sure there was no distortion due to trying the fit with the first and here's how they measured.
Bottom band varied from .499 to .502 (in other words it was not perfectly round) I measured around the full circumference to find the variations.
The middle band was exactly the same.
The nose band measured right on. 505 all around.
Next I ran it into the sizer and by feel tried to decide how much it was sized and then pushed it back out with dowel. The first one came out with the front band sized so that one was set aside and another tried. Very hard to feel what's happening. That one went a bit to far also. On the third one I didn't use lube and now it had a better feel. Success, two bottom bands sized and the forward band untouched.
The new measurements were for the two bottom bands .499 to .5005.
So the base is now more round and smaller. Not by much, but smaller. The forward band still at .505.
Doing a fit test, the first barrel that was too tight to start was now a good fit. I'd say perfect. It took some pressure to push the first two bands in but not difficult. I didn't press into the forward band because I needed something to get my fingernails around to pull it out.
In the second barrel the bullet dropped right in and stopped at the front band. It fell out when the barrel was tipped up.
BTW both of those barrels have pristine bores. The tighter one has been shot quite a bit. The looser one less than 20 shots out of it.