As an alternative, see if there is an FFL near you who will receive the ammo and transfer it to you, if you are concerned. It appears as if the MA Attorney General has been threatening companies selling ammunition to MA residents - but the statutes seem to only apply to purchasing and selling. If you have the proper license to possess firearms/ammunition, I, as a private party, wouldn't hesitate to ship a box or two. It does have to go UPS and be labeled as ORM-D (or whatever the new equivalent to ORM-D is).