Just picked up 50 rounds of L/C Long Range brass $29.39 a pack Mil primer crimpes removed says already prepped but gonna full length resize anyway for my rifle. I weighed each round on my digital scale each one comes in between 175.6 and 176.1 grains. just wanted to know if this is a good price because I can get more. The head stamp is LC 07 LR. Also why does the LC match brass have the grooves around the lower quarter of the case?