Barnes Original .377 caliber ammunition features 255 grain flat nose soft point bullets constructed with pressure-formed 100% copper tubing around a solid lead core for exceptional reliability and performance.Barnes .377 Caliber (0.377'') 255 Grain AmmunitionFlat nose soft point bullet design50 rounds per boxCopper tubing construction with lead coreExpands over 200% of original diameter on impactRetains up to 90% of initial weightIntroduced in 1939 - proven designTrusted by seasoned hunters since 1939 this ammunition delivers consistent accuracy and terminal performance hunt after hunt. The reliable expansion characteristics make it ideal for hunting applications where dependable bullet performance is critical.