I have a DHS special edition Sig P229, .357 Sig with the .40 Cal barrel that you can use interchangeably. Same mags will accept both .357 and .40 rounds. I also have 800 rounds of .357 that I am willing to negotiate with for the price. On Lucky Gunner, the lowest cost of .357 sig is .56/round, which comes out to $460. I am willing to negotiate a package deal.