Speer Gold Dot™ 40 Cal/10mm - 40 cal/10mm GDHP Bullet. TOUGH ENOUGH FOR LAW ENFORCEMENT. When professionals who put their life on the line every day trust Gold Dot™ - you know it’s the best. The same bullet loaded in Speer™ Gold Dot ammunition is available in your favorite handload. That means the same calibers, shapes and quality, which translates to the same superior performance.