Actually, you are talking 4 thousands of an inch here. And in the loading process you would probably knock that much off the length. And if it got to where someone was to give me a ticket for this violation, I would ask it his calipers (if he used them) or his ruler was calibrated and traceable to NIST? If not there is no way this would hold up in any court. Now a bullet 1/4" longer, Yeah you would probably have a problem.