My last Mil. 96 in 6.5x55 put 85gr. HP's, 100gr. HP's, 129gr. SP's and 140gr. Sierras & 160gr. Horandy's into 1 1/2" at 100 meters quite consistently, using only the battle sights. A group composed of all the bullet weights made a 3" group, C to C. As well, my #4 in .312 Express (.350Rem Mag case) makes 1 1/2" groups as well, at 100 meters using .312" Hornadys, yet it's groove dia. (2) is .315".
So, yes - I have seen marvelous results with jacketed bullets in large groove dia. barrels. I am currently experimenting with .312" 174's in an 8.15x46R. Seems to want to shoot them. It also has a .315" groove dia.