What is Jag brass?

i have 350-400 of it. Its weight is 165-168gr, shoots the same as Hornady match brass I have. I run 44.5gr of varget with a 175gr serria HPBT, I would say it lasts as long as the Hornady brass. I mainly bought it because its made a little ways up state, but it turned out to be pretty good.
 
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