My experience with the 284 chambered 99s has been just the opposite, in that they have been the most accurate non-'smithed 99s, along with the 99Cs in 22-250, that I've owned and shot. It takes a lot of "bad" to shoot a 36" group at 100 yards. Most people could shoot 36" with shotgun slug, a smooth bore, and a bead front sight.
Jeff