The Grendel is a great cartridge In the platform it's designed for , an AR. It didnt catch on because the military never picked it up . Ballistically it's Superior to every other ar caliber . I built one a psa with an 18 inch barrel . It shoots under 5/8 of an inch with hand loads . That's amazing In a budget ar . Its so Good it needed a redo in the 6 arc . Just my opinion and experiences . Sorry to hear about your health Dave . I get it, had a stroke 2 years ago but getting better . Hang
in there and pray brother .