New: amm10mmAll contenthive-129948hive-196917krzzansteemhive-183959hive-180932photographyhive-185836uncommonlabhive-166405bitcoinhive-183397hive-144064hive-150122hive-188619hive-109690hive-139150hive-124908krsuccesshive-145157hive-184714hive-193186hive-101145lifeTrendingNewHotLikersammodotcom (54)in army • 3 years agoHistory of 10mm AmmoThis week marks the birthday of Lt. Colonel Jeff Cooper. Cooper was a United States Marine and a pioneer in modern handgun shooting techniques. In the 1980s Cooper developed the 10mm automatic.…