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.30 caliber or 0.3 inches is equivalent to 7.62 millimeters. The 51 in 7.62x51mm is the length of the complete cartridge, but these are just bullets not complete cartridges.

These are not Full cartridges, just the bullets for Reloading. Bullet Material-Jacketed Lead
CA Prop 65-1
Lead Free-No
Reloading Caliber-30 Cal
Reloading Diameter'.308"
Bullet Type-PT
Grain-180 gr
Rounds-500
Brand-Sierra

Hi Josh and welcome. 30 = the bullet diameter. These are component bullets for reloading and not live shootable ammunition. These are 7.62 x 51 / .308 bullets. Cheers and stay safe!