would it be possible to load the 50 alaskan down to subsonic velocities in a 21" encore barrel.i know that in regular whisper loads the a-max 750 or so gr..510 dia. bullet but i don't know about powder..510 is the correct dia. for the alaskan so this bullet choice would not be a problem.mocked up a couple of rounds,[no powder or primers]looks pretty damn impressive.i beleive i could use pulled military stuff as well,graf and son has a selection of that,much cheaper than the hornady.