Your measurements were probably correct.
If you put a precision mic on the different bands and body segments of Barnes' solid copper bullets, you'll find that most are tapered or wasp-wasted (depending on the design).
I'd like to say it's so the bullets can handle the various bore dimensions seen in factory rifles, without causing excessive pressure in the tighter bores. .....but I don't really know if it's
intentional, or just a byproduct (mild defect) of their manufacturing process.
