I've shot both from my LaRue .260 gasser with a 22" barrel and Mausingfield M5 with a 24" Krieger, both rounds were sub MOA for me. The H130 ELD-Ms group better, but we're talking a 0.25MOA difference at 100y, I've also shot both out to 1,000 in the M5 and each was consistent. Because the H130 was consistent in both a gasser and bolt, and generally cheaper than the FGMMs, I've stuck with the Hornady.
FWIW - The FGMMs will not shoot in the gasser without blowing primers. I spoke with Federal and their answer was the round was not made for an AR platform rifle. YMMV.