SinterFire Special Duty (SD) ammunition is a high-performance centerfire handgun load engineered for superior home defense and personal protection. Featuring the popular .40 S&W caliber with a 125 gr projectile, this round utilizes a lead-free frangible hollow point (LFHP) that achieves a muzzle velocity of 1250 ft/s. The frangible technology is designed to dump energy rapidly upon impact and break apart when striking hard surfaces, significantly reducing the risk of over-penetration and dangerous ricochets. Each box contains 20 rounds of ammunition seated in premium brass casings, providing a safe and effective choice for close-quarter defensive scenarios. Safety Note Only use this ammunition in firearms specifically chambered for .40 S&W. This round is not designed for heavy barrier penetration (such as auto glass or thick plywood) as it will disintegrate on contact. While frangible rounds reduce secondary risks, they retain lethal force; always maintain strict firearm safety protocols.