As said you create a problem saying you want to duplicate the military fmj bullet with a non fmj, SP or HP bullet. Not fun, but can be done.
Shotgun News, hard copy has listings for suppliers of bullets. The ones that come to mind would be exact copies of the fmj bullet, that is fmj. Hitechammo.com comes to mind. Patsreloading.com and gibrass.com come to mind. Sometimes they have deals on commercial bullets that are not fmj. From there it is the big outfits, grafs.com, wideners has been mentioned, brownells.com, midwayusa.com, Midsouthshooterssupply.com, Natchez.com, AWWW just google it. They are out there.
Last, and only if price is not a consideration. Mr. Corbin, Dave, corbins.com has a list of manufacturers who make bullets and will make any bullet you desire for a price. (They use Corbin equipment, mainly... surprise.) luck