You can also buy brass cases for the .410. I built a .410 with a .411 Douglas barrel on a Moslin Nigant action but in Oh. they won`t let me use all brass cases. Aonther way to go would be to use .405 win. brass. It is the same lenth as 2 1/2 in 410 cases and uses LR primers. I would also recomand Lead Head bullets. I have pushed their hard cast gas checked bullert to abt 2,600 fps. with no leading.