I feel if anyone/company had gone thru the trouble of developing Nanite based ammo, it would be unintellegent/unprofitable NOT to have a single weapon which fired different projectiles, to use the Nanite ammo. Not only that it would be easier to Create/Make a MultiProjWeapon that it would to have a single ammo sorce from nanites at least at my current understanding of reality
Harry: I am a Catholic whore, currently enjoying congress out of wedlock with my black Jewish boyfriend who works in a military abortion clinic. So hail Satan. And have a lovely afternoon, madam.