If the caliper didn't show that round growing, that's a pretty good test, I think. If it grew significantly with successive rounds, even if not enough to extend beyond the cylinder, I'd be concerned about ignition irregularity. But if it's only a hundredth of an inch or so, don't worry about it.
The only potential problem that comes to mind is if you get cases that are different wall thickness mixed in. Thinner ones don't resize to as narrow a diameter inside. They also tend to spring out more after going through the sizing die, so they may not grip the bullet as firmly. I've had that issue in .45 Auto, where Remington cases in that chambering were so thin at the mouth I could seat bullets with my thumb. Winchester and Starline, among others, going through the same die didn't allow that.
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