For those wanting a .357 Sig load utilizing an expanding bullet, that penetrates very deep, this is it. This lead-free, all copper Barnes TAC-XP bullet, will penetrate roughly 20+ inches in flesh and bone, yet it expands to roughly 55 caliber. We are utilizing a flash retarded powder in this load so that the vision of the shooter will not be significantly impaired should he be required to drop the hammer in low light. Roughly 95% of all civilian shootings in the US happen in low light when the criminal element is most active. Not being blinded by your own gunfire can be a significant advantage.