Product Description Sierra Sports Master handgun bullets are built for reliable expansion and superb accuracy on the range and in the field. Featuring Sierra&';s distinctive serrated "Power Jacket," these jacketed hollow point (JHP) bullets are engineered to expand consistently across a wide range of velocities for dependable weight retention and effective energy transfer. This 10mm Auto/.400 caliber 165 grain projectile is a proven option for varmint and small game use, and it delivers adequate energy for NRA Hunter Silhouette competition. These are reloading bullets (projectiles) and not complete cartridges. Product Highlights Sports Master JHP design engineered for consistent, reliable expansion Serrated Power Jacket promotes uniform mushrooming and energy transfer .400" diameter, 165 grain projectile suited for 10mm Auto / .40 caliber applications 100-count box for high-volume loading, practice, and competition prep Accurate bullet construction proven on the range and in the field Specs Brand: Sierra Product Line: Sports Master Manufacturer Part Number: 8445 UPC: 092763084458 Caliber: 10mm Auto (.400 caliber) Bullet Diameter: 0.400 in Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 165 grain Sectional Density: 0.147 Quantity: 100 bullets per box Core Material: Lead Jacket Material: Copper Cannelure: No Country of Origin: USA Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.