No where does the treaty ban importation of ammo AND there are plenty of American ammo makes out there, in fact I think most of the "big boys" are American made. Ammo runs are just fear mongers driving up the price so they can dump their stocks at a much higher rate and laugh all the way to the bank.
Domestic ammo is already the most expensive ammo out there typically.
Those Mosins won't get shot when ammo is over $1.00 a round.
They are trying to price stuff out of reach. Will competition drive the price down? Perhaps.