It's only a 250 savage that's the only round you can fire in it. The 3000 part of the designation refers to the earlyer models that have rifling meant to stabilize lighter bullets 87grn to get 3000fps velocity. They are NOT different rounds they ARE the one in the same. try sportsmans wherehouse ,Cabelas, and sportco they all had 250 savage ammo last weekend when i was shopping for ammo.