300 BLK - 190gr Hornady SUB-X with N120 and 1680
This guide details the process of handloading .300 Blackout ammunition using Hornady 190gr SUB-X bullets with Accurate 1680 and Vihtavuori N120 powders. It covers case preparation, OAL determination, powder charging, bullet seating, and essential testing phases including velocity measurement, stability assessment, ballistic gel expansion, and final accuracy testing. The instruction comes from an experienced reloader with a deep understanding of internal and terminal ballistics.












