Comparing to a factory round is ok, but the C.O.A.L (or just O.A.L.) is published info and with a caliper there is no reason to guess at it or be uncertain. Either it's in the usable range or it isn't.

You right to be concerned about this. It can affect pressures drastically. If the overall lengths are ok, and with the care you've take in the powder charge, it sounds like you are good to go.

BTW - do a plunk test with the barrel to make sure they chamber right.