Sierra Sports Master 10mm Auto/.40-Caliber 165-Grain Jacketed Hollow Point bullets (brand part no. 8445) are built around the same .400-inch bullet diameter shared by 10mm Auto and .40 S&W, giving reloaders flexibility to load either cartridge with one bullet. Sierra’s proprietary Power Jacket design is engineered for reliable expansion on varmints and small game while still holding the tight tolerances competitive shooters expect on the range. The Sports Master line delivers enough retained energy to be a legitimate option for NRA Hunter Silhouette competition. It’s a dual-purpose bullet for reloaders who want accuracy and expansion in the same load.

Key Specifications

• Bullet diameter is .400 inch, shared by 10mm Auto and .40 S&W.
• Each bullet weighs 165 grains, a common defensive and competition weight in this caliber.
• Sierra’s Power Jacket construction is engineered for reliable, consistent expansion.
• The jacketed hollow point profile balances accuracy with terminal performance.
• Sierra markets this as a Sports Master bullet, suited to both range use and NRA Hunter Silhouette competition.
• Bullets are packaged 100 per box for extended range sessions.
• Ships at approximately 2.4313 lb, light enough to keep freight costs down.

Frequently Asked Questions

Does this bullet work in both 10mm and .40 S&W? Yes, both cartridges share the same .400-inch bullet diameter.

Is this a hunting or target bullet? Both; the Power Jacket design gives reliable expansion while still holding the accuracy Sierra is known for.

What is Sierra’s Power Jacket? A proprietary jacket construction built to assure consistent expansion on varmints and small game.

Buy the Sierra Sports Master 10mm/.40 Caliber 165gr JHP Bullets

Stock your bench with Sierra Sports Master bullets from our reloading bullets selection. Order from our Lubbock, Texas gun shop for fast, reliable shipping.