A 35 mph over will cost you a couple hundred bucks. Shipping ammo through the mail will cost you much more. Not worth the risk.The cost shipping UPS is not that much more.
Maybe for all those folks with questions about shipping via the USPS, a sticky with the Domestic Mail Manual in it might be a big help. Gives all the rules, do's and don'ts.
An Old Pilot, but Not A Bold Pilot "Pig-murderin' Fool"