ull disclosure. I am 100% a fan of the 6.5 Grendel. Ever since I built my first AR15 chambered in the Grendel, I have enjoyed it. It was the first rifle that I built that produced sub-MOA groups, and ballisticaly speaking on paper, the cartridge is a huge step up from the venerable 5.56 NATO. With that being said, is it still relevant in the gas gun world?